Patent Description:
For example, Patent Literature <NUM> discloses a spectrometer including a light entrance part, a dispersive part for dispersing and reflecting light incident thereon from the light entrance part, a light detection element for detecting the light dispersed and reflected by the dispersive part, and a box-shaped support for supporting the light entrance part, dispersive part, and light detection element.

Patent Literature <NUM>: <CIT><CIT>
Document <CIT> relates to a spectroscope (1A) that comprises: a package (<NUM>) having a light incidence section (<NUM>) provided therein; a plurality of lead pins (<NUM>) that pierce a support section (<NUM>) that faces the light incidence section (<NUM>) in the package (<NUM>); a light detection unit (<NUM>) supported on the support section (<NUM>) inside the package (<NUM>); and a spectroscopic unit (<NUM>) supported on the support section (<NUM>) inside the package (<NUM>), so as to be arranged on the support section (<NUM>) side relative to the light detection unit (<NUM>). The light detection unit (<NUM>) has a light passage section (<NUM>) through which light (LI) incident from the light incidence section (<NUM>) is caused to pass. The spectroscopic unit (<NUM>) has a spectroscopic section (<NUM>) that disperses the light (LI) that has passed through the light passage section (<NUM>) and also reflects same to a light detection section (<NUM>). The lead pins (<NUM>) are fitted into a fitting section (<NUM>) provided in the light detection unit (<NUM>) and are electrically connected to the light detection section (<NUM>). Document <CIT> relates to a spectroscopic module <NUM> provided with a spectroscopic unit <NUM> and a photodetector <NUM> in addition to a spectroscopic unit <NUM> and a photodetector <NUM>. A light-transmitting hole 4Z> is disposed between light detecting portions 4a, 9a, while a reflection unit <NUM> is provided so as to oppose a region R in a light-absorbing substrate <NUM>. Ambient light La is absorbed by the region R in the substrate <NUM>. Any part of the light La transmitted through the region R in the substrate <NUM> is reflected to the region R by the unit <NUM> formed so as to oppose the region R, whereby stray light can be inhibited from being caused by the incidence of the light La. Document <CIT> relates to an optical apparatus with: a first substrate having an optical functional element; a second substrate having a movable micromechanical functional element; the first substrate and the second substrate being arranged and interconnected in a stacked manner, so that a light path exists which is convoluted between the first substrate and the second substrate, the movable micromechanical functional element and the optical functional element being arranged in the light path; and a third substrate including a microelectronic functional element, the second substrate being arranged between the first substrate and the third substrate. Document <CIT> relates to a spectrometer <NUM>, in which a spectroscopic unit <NUM> spectrally resolves and reflects light L1 having entered the inside of a package <NUM> while a photodetector <NUM> detects reflected light L2, comprises a package <NUM> accommodating the photodetector <NUM> therein. The package <NUM> has a semi-spherical recess <NUM>, while the recess <NUM> has a bottom face formed with an area <NUM> having a plurality of grating grooves <NUM> arranged in a row along a predetermined direction and an area <NUM> surrounding the area <NUM>. The areas <NUM> and <NUM> are continuous with each other and formed on the same curved surface.

The above-described spectrometer requires further miniaturization in response to expansion of use. However, as the spectrometer is further miniaturized, detection accuracy of the spectrometer more easily decreases due to various causes.

It is therefore an object of the present invention to provide a spectrometer which can attempt miniaturization while suppressing a decrease in detection accuracy, and a method for manufacturing a spectrometer capable of easily manufacturing such a spectrometer.

The spectrometer in accordance with one aspect of the present invention includes the features of claim <NUM>. Favourable modifications are defined in the dependent claims.

In the spectrometer, an optical path from the light passing part to the light detection part is formed in the space which is formed by the light detection element and the support. In this way, miniaturization of the spectrometer may be attempted. Further, the wiring electrically connected to the light detection part is provided in the support, and the second end part of the wiring on the opposite side from the light detection part side is positioned on the second surface of the base wall part on the opposite side from the space side. In this way, even when an external force acts on the second end part of the wiring, the support is rarely distorted. Thus, it is possible to suppress a decrease in detection accuracy (a shift of a peak wavelength in light detected by the light detection part, etc.) resulting from occurrence of a variance in a positional relationship between the dispersive part and the light detection part. In addition, the second end part of the wiring is formed on the second surface of the base wall part, and thus an external force may be inhibited from acting on the light detection element at the time of mounting, and damage to the light detection element may be reduced when compared to a conventional art in which a circuit board is directly connected to the light detection element. Therefore, the spectrometer may attempt miniaturization while suppressing a decrease in detection accuracy.

In the spectrometer in accordance with one aspect of the present invention, a depression open to the side of the space may be formed in the base wall part, and the dispersive part may be provided on an inner surface of the depression. According to this configuration, it is possible to obtain the highly reliable dispersive part, and to attempt miniaturization of the spectrometer. Further, even when reflected light is generated in the light detection part, the reflected light may be inhibited from reaching the light detection part again by a region around the depression on the first surface of the base wall part.

In the spectrometer in accordance with one aspect of the present invention, the second end part of the wiring may be positioned in a region around the depression on the second surface of the base wall part when viewed in a thickness direction of the base wall part. According to this configuration, it is possible to inhibit the dispersive part from being deformed due to an external force acting on the second end part of the wiring.

The spectrometer in accordance with one aspect of the present invention may further include a first reflection part provided in the support and configured to reflect the light passing through the light passing part in the space, and a second reflection part provided in the light detection element and configured to reflect the light reflected by the first reflection part to the dispersive part in the space. According to this configuration, an incident direction of the light entering the dispersive part and a divergence or convergence state of the light may be easily adjusted. Thus, even when the length of the optical path from the dispersive part to the light detection part is made short, the light dispersed by the dispersive part may be accurately concentrated on a predetermined position of the light detection part.

In the spectrometer in accordance with one aspect of the present invention, the first end part of the wiring may be connected to the terminal of the light detection element in a fixed part of the light detection element and the support. According to this configuration, the electrical connection between the light detection part and the wiring may be secured.

In the spectrometer in accordance with one aspect of the present invention, a material of the support may be ceramic. According to this configuration, it is possible to suppress expansion and contraction of the support resulting from a temperature change of an environment in which the spectrometer is used, etc. Therefore, it is possible to more reliably suppress a decrease in detection accuracy (a shift of a peak wavelength in light detected by the light detection part, etc.) resulting from occurrence of a variance in a positional relationship between the dispersive part and the light detection part.

In the spectrometer in accordance with one aspect of the present invention, the space may be airtightly sealed by a package including the light detection element and the support as components. According to this configuration, it is possible to suppress a decrease in detection accuracy resulting from deterioration of a member in the space due to moisture, occurrence of condensation in the space due to a decrease in ambient temperature, etc..

In the spectrometer in accordance with one aspect of the present invention, the space may be airtightly sealed by a package accommodating the light detection element and the support. According to this configuration, it is possible to suppress a decrease in detection accuracy resulting from deterioration of a member in the space due to moisture, occurrence of condensation in the space due to a decrease in ambient temperature, etc..

The method for manufacturing a spectrometer in accordance with one aspect of the present invention includes the steps of claim <NUM>.

In the method for manufacturing the spectrometer in accordance with one aspect of the present invention, the optical path from the light passing part to the light detection part is formed in the space, and the wiring is electrically connected to the light detection part only by fixing the support provided with the wiring and the dispersive part to the light detection element provided with the light passing part and the light detection part. Therefore, according to the method for manufacturing the spectrometer, it is possible to easily produce the spectrometer which can attempt miniaturization while suppressing a decrease in detection accuracy. The first step and the second step may be implemented in an arbitrary order.

The present invention can provide a spectrometer which can attempt miniaturization while suppressing a decrease in detection accuracy, and a method for manufacturing a spectrometer capable of easily manufacturing such a spectrometer.

In the following, preferred embodiments of the present invention will be explained in detail with reference to the drawings. In the drawings, the same or equivalent parts will be referred to with the same signs while omitting their overlapping descriptions.

As illustrated in <FIG> and <FIG>, a spectrometer 1A includes a light detection element <NUM>, a support <NUM>, a first reflection part <NUM>, a second reflection part <NUM>, a dispersive part <NUM>, and a cover <NUM>. The light detection element <NUM> is provided with a light passing part <NUM>, a light detection part <NUM>, and a zero-order light capture part <NUM>. The support <NUM> is provided with a wiring <NUM> for inputting/outputting electric signals to/from the light detection part <NUM>. The support <NUM> is fixed to the light detection element <NUM> such that a space S is formed among the light passing part <NUM>, the light detection part <NUM>, and the zero-order light capture part <NUM>. For example, the spectrometer 1A is formed in a shape of a rectangular parallelepiped, a length of which in each of an X-axis direction, a Y-axis direction, and a Z-axis direction is less than or equal to <NUM>. The wiring <NUM> and the support <NUM> are configured as a molded interconnect device (MID).

The light passing part <NUM>, the first reflection part <NUM>, the second reflection part <NUM>, the dispersive part <NUM>, the light detection part <NUM>, and the zero-order light capture part <NUM> are arranged side by side along a reference line RL that extends in the X-axis direction when viewed in an optical axis direction (that is, the Z-axis direction) of light L1 passing through the light passing part <NUM>. In the spectrometer 1A, the light L1 passing through the light passing part <NUM> is reflected by the first reflection part <NUM> and the second reflection part <NUM> in sequence, enters the dispersive part <NUM>, and is dispersed and reflected in the dispersive part <NUM>. Then, light L2 other than zero-order light L0 in light dispersed and reflected in the dispersive part <NUM> enters the light detection part <NUM> and is detected by the light detection part <NUM>. The zero-order light L0 in the light dispersed and reflected in the dispersive part <NUM> enters the zero-order light capture part <NUM> and is captured by the zero-order light capture part <NUM>. An optical path of the light L1 from the light passing part <NUM> to the dispersive part <NUM>, an optical path of the light L2 from the dispersive part <NUM> to the light detection part <NUM>, and an optical path of the zero-order light L0 from the dispersive part <NUM> to the zero-order light capture part <NUM> are formed in the space S.

The light detection element <NUM> includes a substrate <NUM>. For example, the substrate <NUM> is formed in a rectangular plate shape using a semiconductor material such as silicone. The light passing part <NUM> is a slit formed in the substrate <NUM>, and extends in the Y-axis direction. The zero-order light capture part <NUM> is a slit formed in the substrate <NUM>, and extends in the Y-axis direction between the light passing part <NUM> and the light detection part <NUM>. In the light passing part <NUM>, an end part on an entrance side of the light L1 widens toward the entrance side of the light L1 in each of the X- and Y-axis directions. In addition, in the zero-order light capture part <NUM>, an end part on the opposite side from an entrance side of the zero-order light L0 widens toward the opposite side from the entrance side of the zero-order light L0 in each of the X- and Y-axis directions. When the zero-order light L0 is configured to obliquely enter the zero-order light capture part <NUM>, the zero-order light L0 entering the zero-order light capture part <NUM> may be more reliably inhibited from returning to the space S.

The light detection part <NUM> is provided on a surface 24a of the substrate <NUM> on the space S side. More specifically, the light detection part <NUM> is put in the substrate <NUM> made of the semiconductor material rather than being attached to the substrate <NUM>. That is, the light detection part <NUM> includes a plurality of photodiodes formed in a first conductivity type region inside the substrate <NUM> made of the semiconductor material and a second conductivity type region provided within the region. For example, the light detection part <NUM> is configured as a photodiode array, a C-MOS image sensor, a CCD image sensor, etc., and has a plurality of light detection channels arranged along the reference line RL. Lights L2 having different wavelengths are let into the respective light detection channels of the light detection part <NUM>. A plurality of terminals <NUM> for inputting/outputting electric signals to/from the light detection part <NUM> is provided on the surface 24a of the substrate <NUM>. The light detection part <NUM> may be configured as a surface-incident photodiode or a back surface-incident photodiode. For example, when the light detection part <NUM> is configured as the surface-incident photodiode, the light detection part <NUM> is positioned at the same height as that of a light exit of the light passing part <NUM> (that is, the surface 24a of the substrate <NUM> on the space S side). In addition, for example, when the light detection part <NUM> is configured as the back surface-incident photodiode, the light detection part <NUM> is positioned at the same height as that of a light entrance of the light passing part <NUM> (that is, a surface 24b of the substrate <NUM> on the opposite side from the space S side).

The support <NUM> has a base wall part <NUM>, a pair of side wall parts <NUM>, and a pair of side wall parts <NUM>. The base wall part <NUM> opposes the light detection element <NUM> in the Z-axis direction through the space S. A depression <NUM> open to the space S side, a plurality of projections <NUM> protruding to the opposite side from the space S side, and a plurality of through holes <NUM> open to the space S side and the opposite side from the space S side are formed in the base wall part <NUM>. The pair of side wall parts <NUM> opposes each other in the X-axis direction through the space S. The pair of side wall parts <NUM> opposes each other in the Y-axis direction through the space S. The base wall part <NUM>, the pair of side wall parts <NUM>, and the pair of side wall parts <NUM> are integrally formed using ceramic such as AlN or Al<NUM>O<NUM>.

The first reflection part <NUM> is provided in the support <NUM>. More specifically, the first reflection part <NUM> is provided on a flat inclined surface <NUM> inclined at a predetermined angle in a surface (first surface) 31a of the base wall part <NUM> on the space S side with a molded layer <NUM> interposed therebetween. For example, the first reflection part <NUM> is a planar mirror including a metal evaporated film of Al, Au, etc. and having a mirror surface. The first reflection part <NUM> reflects the light L1 passing through the light passing part <NUM> to the second reflection part <NUM> in the space S. The first reflection part <NUM> may be directly formed on the inclined surface <NUM> of the support <NUM> without the molded layer <NUM> interposed therebetween.

The second reflection part <NUM> is provided in the light detection element <NUM>. More specifically, the second reflection part <NUM> is provided in a region between the light passing part <NUM> and the zero-order light capture part <NUM> on the surface 24a of the substrate <NUM>. For example, the second reflection part <NUM> is a planar mirror including a metal evaporated film of Al, Au, etc. and having a mirror surface. The second reflection part <NUM> reflects the light L1, which is reflected by the first reflection part <NUM>, to the dispersive part <NUM> in the space S.

The dispersive part <NUM> is provided in the support <NUM>. Details thereof are described below. That is, the molded layer <NUM> is disposed to cover the depression <NUM> on the surface 31a of the base wall part <NUM>. The molded layer <NUM> is formed into a film along an inner surface 34a of the depression <NUM>. For example, a grating pattern 41a corresponding to a blazed grating having a serrated cross section, a binary grating having a rectangular cross section, a holographic grating having a sinusoidal cross section, etc. is formed in a predetermined region of the molded layer <NUM> corresponding to a spherical region on the inner surface 34a. For example, a reflecting film <NUM> including a metal evaporated film of Al, Au, etc. is formed on the molded layer <NUM> to cover the grating pattern 41a. The reflecting film <NUM> is formed along a shape of the grating pattern 41a. A surface of the reflecting film <NUM>, which is formed along the shape of the grating pattern 41a, on the space S side serves as the dispersive part <NUM> in the form of a reflection grating. The molded layer <NUM> is formed by pressing a mold die against a molding material (e.g., photocuring epoxy resins, acrylic resins, fluorine-based resins, silicone, and replica optical resins such as organic/inorganic hybrid resins) and curing the molding material (by photocuring or thermal curing using UV light, etc.) in this state.

As described in the foregoing, the dispersive part <NUM> is provided on the inner surface 34a of the depression <NUM> in the surface 31a of the base wall part <NUM>. The dispersive part <NUM> has a plurality of grating grooves arranged along the reference line RL, and disperses and reflects the light L1, which is reflected by the second reflection part <NUM>, to the light detection part <NUM> in the space S. The dispersive part <NUM> is not restricted to a dispersive part directly formed in the support <NUM> as described above. For example, the dispersive part <NUM> may be provided in the support <NUM> by attaching a dispersive element, which has the dispersive part <NUM> and a substrate on which the dispersive part <NUM> is formed, to the support <NUM>.

Each wiring <NUM> has an end part (first end part) 13a on the light detection part <NUM> side, an end part (second end part) 13b on the opposite side from the light detection part <NUM> side, and a connection part 13c. The end part 13a of each wiring <NUM> is positioned on an end surface 32a of each side wall part <NUM> to oppose each terminal <NUM> of the light detection element <NUM>. The end part 13b of each wiring <NUM> is positioned on a surface of each projection <NUM> in a surface (second surface) 31b on the opposite side from the space S side in the base wall part <NUM>. The connection part 13c of each wiring <NUM> reaches the end part 13b from the end part 13a on a surface 32b of each side wall part <NUM> on the space S side, the surface 31a of the base wall part <NUM>, and an inner surface of each through hole <NUM>. In this way, when the wiring <NUM> encloses a surface of the support <NUM> on the space S side, deterioration of the wiring <NUM> may be prevented.

For example, the terminal <NUM> of the light detection element <NUM> and the end part 13a of the wiring <NUM> opposing each other are connected to each other by a bump <NUM> made of Au, solder, etc. In the spectrometer 1A, the support <NUM> is fixed to the light detection element <NUM>, and a plurality of wirings <NUM> is electrically connected to the light detection part <NUM> of the light detection element <NUM> by a plurality of bumps <NUM>. In this way, the end part 13a of each wiring <NUM> is connected to each terminal <NUM> of the light detection element <NUM> in a fixed part of the light detection element <NUM> and the support <NUM>.

The cover <NUM> is fixed to the surface 24b of the substrate <NUM> of the light detection element <NUM> on the opposite side from the space S side. The cover <NUM> has a light transmitting member <NUM> and a light shielding film <NUM>. For example, the light transmitting member <NUM> is formed in a rectangular plate shape using a material which transmits the light L1 therethrough, examples of which include silica, borosilicate glass (BK7), Pyrex (registered trademark) glass, and Kovar glass. The light shielding film <NUM> is formed on a surface 51a of the light transmitting member <NUM> on the space S side. A light transmitting opening 52a is formed in the light shielding film <NUM> to oppose the light passing part <NUM> of the light detection element <NUM> in the Z-axis direction. The light transmitting opening 52a is a slit formed in the light shielding film <NUM>, and extends in the Y-axis direction. In the spectrometer 1A, an entrance NA of the light L1 that enters the space S is defined by the light transmitting opening 52a of the light shielding film <NUM> and the light passing part <NUM> of the light detection element <NUM>.

When an infrared ray is detected, silicon, germanium, etc. is effective as a material of the light transmitting member <NUM>. In addition, the light transmitting member <NUM> may be provided with an AR (Anti Reflection) coat, and may have such a filter function as to transmit therethrough only a predetermined wavelength of light. Further, for example, a black resist, Al, etc. may be used as a material of the light shielding film <NUM>. Here, the black resist is effective as the material of the light shielding film <NUM> from a viewpoint that the zero-order light L0 entering the zero-order light capture part <NUM> is inhibited from returning to the space S.

For example, a sealing member <NUM> made of resin, etc. is disposed among the surface 24a of the substrate <NUM>, the end surface 32a of each side wall part <NUM>, and the end surface 33a of each side wall part <NUM>. In addition, for example, a sealing member <NUM> made of glass beads, etc. is disposed inside the through hole <NUM> of the base wall part <NUM>, and the inside of the through hole <NUM> is filled with a sealing member <NUM> made of resin. In the spectrometer 1A, the space S is airtightly sealed by a package 60A that includes the light detection element <NUM>, the support <NUM>, the cover <NUM>, and the sealing members <NUM>, <NUM>, and <NUM> as components. When the spectrometer 1A is mounted on an external circuit board, the end part 13b of each wiring <NUM> functions as an electrode pad. The light passing part <NUM> and the zero-order light capture part <NUM> of the substrate <NUM> may be airtightly sealed by filling the light passing part <NUM> and the zero-order light capture part <NUM> of the substrate <NUM> with light transmitting resin in place of disposing the cover <NUM> on the surface 24b of the substrate <NUM>. In addition, for example, the inside of the through hole <NUM> of the base wall part <NUM> may be filled with only the sealing member <NUM> made of the resin without disposing the sealing member <NUM> made of the glass beads, etc..

As described in the foregoing, in the spectrometer 1A, an optical path from the light passing part <NUM> to the light detection part <NUM> is formed inside the space S which is formed by the light detection element <NUM> and the support <NUM>. In this way, miniaturization of the spectrometer 1A may be attempted. Further, the wiring <NUM> electrically connected to the light detection part <NUM> is provided in the support <NUM>, and the end part 13b of the wiring <NUM> on the opposite side from the light detection part <NUM> side is positioned on the surface 31b of the base wall part <NUM> on the opposite side from the space S. In this way, even when an external force acts on the end part 13b of the wiring <NUM>, the support <NUM> is rarely distorted. Thus, it is possible to suppress a decrease in detection accuracy (a shift of a peak wavelength in light detected by the light detection part <NUM>, etc.) resulting from occurrence of a variance in a positional relationship between the dispersive part <NUM> and the light detection part <NUM>. In addition, the end part 13b of the wiring <NUM> is formed on the surface 31b of the base wall part <NUM>, and thus an external force may be inhibited from acting on the light detection element <NUM> at the time of mounting, and damage to the light detection element <NUM> may be reduced when compared to a conventional art in which a circuit board is directly connected to the light detection element <NUM>. Therefore, the spectrometer 1A may attempt miniaturization while suppressing a decrease in detection accuracy.

In addition, in the spectrometer 1A, the depression <NUM> open to the space S side is formed in the base wall part <NUM>, and the dispersive part <NUM> is provided on the inner surface 34a of the depression <NUM>. In this way, it is possible to obtain the highly reliable dispersive part <NUM>, and to attempt miniaturization of the spectrometer 1A. Further, even when reflected light is generated in the light detection part <NUM>, the reflected light may be inhibited from reaching the light detection part <NUM> again by a region around the depression <NUM> on the surface 31a of the base wall part <NUM>. Furthermore, even when an external force acts on the support <NUM>, an impact may be inhibited from being directly applied to the dispersive part <NUM> by the region around the depression <NUM> on the surface 31a of the base wall part <NUM>.

In addition, in the spectrometer 1A, the first reflection part <NUM> that reflects the light L1 passing through the light passing part <NUM> is provided in the support <NUM>, and the second reflection part <NUM> that reflects the light L1, which is reflected by the first reflection part <NUM>, to the dispersive part <NUM> is provided in the light detection element <NUM>. In this way, an incident direction of the light L1 entering the dispersive part <NUM> and a divergence or convergence state of the light L1 may be easily adjusted. Thus, even when the length of the optical path from the dispersive part <NUM> to the light detection part <NUM> is made short, the light L2 dispersed by the dispersive part <NUM> may be accurately concentrated on a predetermined position of the light detection part <NUM>.

In addition, in the spectrometer 1A, the end part 13a of the wiring <NUM> is connected to the terminal <NUM> of the light detection element <NUM> in the fixed part of the light detection element <NUM> and the support <NUM>. In this way, the electrical connection between the light detection part <NUM> and the wiring <NUM> may be secured.

In addition, in the spectrometer 1A, a material of the support <NUM> is ceramic. In this way, it is possible to suppress expansion and contraction of the support <NUM> resulting from a temperature change of an environment in which the spectrometer 1A is used, generation of heat in the light detection part <NUM>, etc. Therefore, it is possible to suppress a decrease in detection accuracy (a shift of a peak wavelength in light detected by the light detection part <NUM>, etc.) resulting from occurrence of a variance in a positional relationship between the dispersive part <NUM> and the light detection part <NUM>. Since the spectrometer 1A is miniaturized, there is concern that a slight change in an optical path may greatly affect an optical system, leading to a decrease in detection accuracy. For this reason, in particular, as described in the foregoing, when the dispersive part <NUM> is directly formed in the support <NUM>, it is significantly important to suppress expansion and contraction of the support <NUM>.

In addition, in the spectrometer 1A, the first reflection part <NUM> serves as the planar mirror. In this way, when the entrance NA of the light L1 passing through the light passing part <NUM> is made small, and an inequality of "the optical path length, from the light passing part <NUM> to the dispersive part <NUM>, of the light L1 having the same spread angle as a spread angle of the light L1 passing through the light passing part <NUM>" > "the optical path length from the dispersive part <NUM> to the light detection part <NUM>" is satisfied (optical reduction system), resolving power of the light L2 dispersed by the dispersive part <NUM> may be increased. Details thereof are described below. That is, when the first reflection part <NUM> is a planar mirror, the dispersive part <NUM> is irradiated with the light L1 while the light L1 spreads. For this reason, the entrance NA of the light L1 passing through the light passing part <NUM> needs to be made small from a viewpoint that a region of the dispersive part <NUM> is inhibited from widening and a viewpoint that a length at which the dispersive part <NUM> concentrates the light L2 on the light detection part <NUM> is inhibited from becoming longer. Therefore, resolving power of the light L2 dispersed by the dispersive part <NUM> may be increased by reducing the entrance NA of the light L1 and setting an optical reduction system.

In addition, in the spectrometer 1A, the space S is airtightly sealed by the package 60A that includes the light detection element <NUM> and the support <NUM> as components. In this way, it is possible to suppress a decrease in detection accuracy resulting from deterioration of a member in the space S due to moisture, occurrence of condensation in the space S due to a decrease in ambient temperature, etc..

In addition, in the spectrometer 1A, the second reflection part <NUM> is provided in the light detection element <NUM>. In the light detection element <NUM>, the surface 24a of the substrate <NUM> on which the second reflection part <NUM> is formed is a flat surface. Further, the second reflection part <NUM> may be formed in a step of manufacturing the light detection element <NUM>. Thus, the second reflection part <NUM> according to a desired NA may be accurately formed by controlling a shape, an area, etc. of the second reflection part <NUM>.

In addition, in the spectrometer 1A, a flat region (which may be slightly inclined) is present around the depression <NUM> on the surface 31a of the base wall part <NUM>. In this way, even when reflected light is generated in the light detection part <NUM>, the reflected light may be inhibited from reaching the light detection part <NUM> again. Further, when the molded layer <NUM> is formed on the inner surface 34a of the depression <NUM> by pressing a mold die against resin, and when the sealing member <NUM> made of resin is disposed among the surface 24a of the substrate <NUM>, the end surface 32a of each side wall part <NUM>, and the end surface 33a of each side wall part <NUM>, the flat region serves as a shelter for surplus resin. In this instance, when the surplus resin is allowed to flow into the through hole <NUM> of the base wall part <NUM>, for example, the sealing member <NUM> made of the glass beads, etc. is unnecessary, and the resin functions as the sealing member <NUM>.

In addition, in a step of manufacturing the spectrometer 1A, as described in the foregoing, the molded layer <NUM>, which is smooth, is formed on the inclined surface <NUM> of the base wall part <NUM> using a mold die, and the first reflection part <NUM> is formed on the molded layer <NUM>. Normally, a surface of the molded layer <NUM> is less uneven and smoother than a surface of the support <NUM>, and thus the first reflection part <NUM> having the mirror surface may be more accurately formed. However, when the first reflection part <NUM> is directly formed on the inclined surface <NUM> of the base wall part <NUM> without the molded layer <NUM> interposed therebetween, a molding material used for the molded layer <NUM> may be reduced, and a shape of the mold die may be simplified. Thus, the molded layer <NUM> may be easily formed.

In addition, in the spectrometer 1A, the light passing part <NUM>, the first reflection part <NUM>, the second reflection part <NUM>, the dispersive part <NUM>, and the light detection part <NUM> are arranged along the reference line RL when viewed from the optical axis direction of the light L1 passing through the light passing part <NUM>. Further, the dispersive part <NUM> has the plurality of grating grooves arranged along the reference line RL, and the light detection part <NUM> has the plurality of light detection channels arranged along the reference line RL. In this way, the light L2 dispersed by the dispersive part <NUM> may be more accurately concentrated on each of the light detection channels of the light detection part <NUM>.

As illustrated in <FIG>, for example, the cover <NUM> may further include a light shielding film <NUM> made of a black resist, Al, etc. The light shielding film <NUM> is formed on a surface 51b on the opposite side from the space S side in the light transmitting member <NUM>. A light transmitting opening 53a is formed in the light shielding film <NUM> to oppose the light passing part <NUM> of the light detection element <NUM> in the Z-axis direction. The light transmitting opening 53a is a slit formed in the light shielding film <NUM>, and extends in the Y-axis direction. In this case, the entrance NA of the light L1 entering the space S may be more accurately defined using the light transmitting opening 53a of the light shielding film <NUM>, the light transmitting opening 52a of the light shielding film <NUM>, and the light passing part <NUM> of the light detection element <NUM>.

In addition, as illustrated in <FIG>, the cover <NUM> may further include the above-described light shielding film <NUM>, and a light transmitting opening 52b may be formed in the light shielding film <NUM> to oppose the zero-order light capture part <NUM> of the light detection element <NUM> in the Z-axis direction. In this case, it is possible to more reliably inhibit the zero-order light L0 entering the zero-order light capture part <NUM> from returning to the space S.

In addition, when the spectrometer 1A is produced, the support <NUM> provided with the wiring <NUM>, the first reflection part <NUM>, and the dispersive part <NUM> is prepared (first step), the light detection element <NUM> provided with the light passing part <NUM>, the second reflection part <NUM>, and the light detection part <NUM> is prepared (second step), and then the optical path from the light passing part <NUM> to the light detection part <NUM> is formed in the space S, and the wiring <NUM> is electrically connected to the light detection part <NUM> by fixing the support <NUM> to the light detection element <NUM> such that the space S is formed (third step). As described above, the optical path from the light passing part <NUM> to the light detection part <NUM> is formed in the space S, and the wiring <NUM> is electrically connected to the light detection part <NUM> only by fixing the support <NUM> to the light detection element <NUM>. Therefore, according to a method for manufacturing the spectrometer 1A, it is possible to easily produce the spectrometer 1A which can attempt miniaturization while suppressing a decrease in detection accuracy. The step of preparing the support <NUM> and the step of preparing the light detection element <NUM> may be implemented in an arbitrary order.

In particular, when the spectrometer 1A is produced, in addition to the electrical connection between the wiring <NUM> and the light detection part <NUM>, fixing of the support <NUM> to the light detection element <NUM> and formation of the optical path from the light passing part <NUM> to the light detection part <NUM> are implemented only by connecting the end part 13a of the wiring <NUM> provided in the support <NUM> to the terminal <NUM> of the light detection element <NUM>.

As illustrated in <FIG> and <FIG>, a spectrometer 1B is mainly different from the above-described spectrometer 1A in that a first reflection part <NUM> is a concave mirror. In the spectrometer 1B, the first reflection part <NUM> is provided in a spherical region on an inner surface 34a of a depression <NUM> of a base wall part <NUM> with a molded layer <NUM> interposed therebetween. For example, the first reflection part <NUM> is a concave mirror which is made of a metal evaporated film of Al, Au, etc. and has a mirror surface, and reflects light L1 passing through a light passing part <NUM> to a second reflection part <NUM> in a space S. The first reflection part <NUM> may be directly formed on the inner surface 34a of the depression <NUM> in a support <NUM> without the molded layer <NUM> interposed therebetween. In addition, a cover <NUM> may have a configuration illustrated in <FIG> and <FIG>.

According to the spectrometer 1B configured as described above, it is possible to attempt miniaturization while suppressing a decrease in detection accuracy due to a similar reason to that in the above-described spectrometer 1A. Further, in the spectrometer 1B, the first reflection part <NUM> is the concave mirror. In this way, a spread angle of the light L1 is suppressed by the first reflection part <NUM>, and thus the entrance NA of the light L1 passing through a light passing part <NUM> may be increased to increase sensitivity, and the length of an optical path from a dispersive part <NUM> to a light detection part <NUM> may be further decreased to further miniaturize the spectrometer 1B. Details thereof are described below. That is, when the first reflection part <NUM> is the concave mirror, the dispersive part <NUM> is irradiated with the light L1 while the light L1 is approximately collimated. For this reason, a distance at which the dispersive part <NUM> concentrates light L2 on the light detection part <NUM> is short when compared to a case in which the dispersive part <NUM> is irradiated with the light L1 while the light L1 spreads. Therefore, the entrance NA of the light L1 may be increased to increase sensitivity, and the optical path length from the dispersive part <NUM> to the light detection part <NUM> may be further decreased to further miniaturize the spectrometer 1B.

As illustrated in <FIG> and <FIG>, a spectrometer 1C is mainly different from the above-described spectrometer 1A in that a space S is airtightly sealed by a package 60B that accommodates a light detection element <NUM> and a support <NUM>. The package 60B includes a stem <NUM> and a cap <NUM>. For example, the stem <NUM> is formed in a disc shape using metal. For example, the cap <NUM> is formed in a cylindrical shape using metal. The stem <NUM> and the cap <NUM> are airtightly joined to each other while a flange part 61a provided on an outer edge of the stem <NUM> and a flange part 62a provided at an opening end of the cap <NUM> are in contact with each other. By way of example, the stem <NUM> and the cap <NUM> are airtightly sealed to each other in a nitrogen atmosphere under dew point management (e.g., at -<NUM>) or an atmosphere subjected to vacuum drawing.

A light entrance part <NUM> is provided on a wall part 62b of the cap <NUM> opposing the stem <NUM> to oppose a light passing part <NUM> of a light detection element <NUM> in a Z-axis direction. The light entrance part <NUM> is configured by airtightly joining a window member <NUM> to an inner surface of the wall part 62b to cover a light transmission hole 62c formed in the wall part 62b. The light transmission hole 62c has a shape including the light passing part <NUM> when viewed in the Z-axis direction. For example, the window member <NUM> is formed in a plate shape using a material which transmits light L1 therethrough, examples of which include silica, borosilicate glass (BK7), Pyrex (registered trademark) glass, and Kovar glass. In the spectrometer 1C, the light L1 enters the light passing part <NUM> through the light entrance part <NUM> from the outside of the package 60B. When an infrared ray is detected, silicon, germanium, etc. is effective as a material of the window member <NUM>. In addition, the window member <NUM> may be provided with an AR coat, and may have such a filter function as to transmit therethrough only a predetermined wavelength of light. Further, at least a portion of the window member <NUM> may be disposed inside the light transmission hole 62c such that an outer surface of the window member <NUM> and an outer surface of the wall part 62b are flush with each other.

A plurality of through holes 61b is formed in the stem <NUM>. Lead pins <NUM> are inserted into the respective through holes 61b. For example, each of the lead pins <NUM> is airtightly fixed to each of the through holes 61b through a hermetic seal made of sealing glass such as low-melting glass having electrically-insulating and light-shielding properties. An end part inside the package 60B in each of the lead pins <NUM> is connected to an end part 13b of each wiring <NUM> provided in the support <NUM> on a surface 31b of a base wall part <NUM>. In this way, electrical connection between the lead pin <NUM> and the wiring <NUM> corresponding to each other, and positioning of the light detection element <NUM> and the support <NUM> with respect to the package 60B are achieved.

The end part inside the package 60B in the lead pin <NUM> may be connected to the end part 13b of the wiring <NUM> extending inside a through hole formed in the base wall part <NUM> or inside a depression formed on the surface 31b of the base wall part <NUM> while being disposed inside the through hole or inside the depression. In addition, the end part inside the package 60B in the lead pin <NUM> and the end part 13b of the wiring <NUM> may be electrically connected to each other through a circuit board on which the support <NUM> is mounted by bump bonding, etc. In this case, the end part inside the package 60B in the lead pin <NUM> may be disposed to surround the support <NUM> when viewed in a thickness direction of the stem <NUM> (that is, the Z-axis direction). In addition, the circuit board may be disposed in the stem <NUM> while touching the stem <NUM>, or may be supported by the plurality of lead pins <NUM> while being separated from the stem <NUM>.

In the spectrometer 1C, for example, a substrate <NUM> of the light detection element <NUM> and the base wall part <NUM> of the support <NUM> are formed in hexagonal plate shapes. Further, the light detection element <NUM> and the support <NUM> are accommodated in the package 60B. Thus, in the spectrometer 1C, a connection part 13c of each wiring <NUM> may not be enclosed on a surface 32b of each side wall part <NUM> on the space S side, a surface 31a of the base wall part <NUM>, and an inner surface of each through hole <NUM> as in the above-described spectrometer 1A. In the spectrometer 1C, the connection part 13c of each wiring <NUM> reaches the end part 13b from an end part 13a on a surface of each side wall part <NUM> on the opposite side from the space S side and the surface 31b of the base wall part <NUM>. In this way, when the wiring <NUM> is enclosed on a surface of the support <NUM> on the opposite side from the space S side, scattering of light due to the wiring <NUM> exposed to the space S may be prevented. Further, in the spectrometer 1C, sealing members <NUM>, <NUM>, and <NUM> may not be disposed, and a cover <NUM> may not be provided as in the above-described spectrometer 1A.

According to the spectrometer 1C configured as described above, it is possible to attempt miniaturization while suppressing a decrease in detection accuracy due to a similar reason to that in the above-described spectrometer 1A. In addition, in the spectrometer 1C, the space S is airtightly sealed by the package 60B that accommodates the light detection element <NUM> and the support <NUM>. In this way, it is possible to suppress a decrease in detection accuracy resulting from deterioration of a member in the space S due to moisture, occurrence of condensation in the space S due to a decrease in ambient temperature, etc..

In addition, in the spectrometer 1C, a gap is formed among an end surface 32a of each side wall part <NUM> of the support <NUM>, an end surface 33a of each side wall part <NUM>, and a surface 24a of the substrate <NUM> of the light detection element <NUM>. In this way, deformation of the light detection element <NUM> rarely affects the support <NUM>, and deformation of the support <NUM> rarely affects the light detection element <NUM>, and thus an optical path from the light passing part <NUM> to the light detection part <NUM> may be accurately maintained.

In addition, in the spectrometer 1C, the support <NUM> is supported by the plurality of lead pins <NUM> while being separated from the stem <NUM>. In this way, deformation of the stem <NUM>, an external force from the outside of the package 60B, etc. rarely affect the support <NUM>, and thus the optical path from the light passing part <NUM> to the light detection part <NUM> may be accurately maintained.

As illustrated in <FIG> and <FIG>, a spectrometer 1D is mainly different from the spectrometer 1C in that a first reflection part <NUM> is a concave mirror. In the spectrometer 1D, the first reflection part <NUM> is provided in a spherical region on an inner surface 34a of a depression <NUM> of a base wall part <NUM> with a molded layer <NUM> interposed therebetween. For example, the first reflection part <NUM> is a concave mirror made of a metal evaporated film of Al, Au, etc., and reflects light L1 passing through a light passing part <NUM> to a second reflection part <NUM> in a space S.

According to the spectrometer 1D configured as described above, it is possible to attempt miniaturization while suppressing a decrease in detection accuracy due to a similar reason to that in the above-described spectrometer 1A. Further, in the spectrometer 1D, the first reflection part <NUM> is the concave mirror. In this way, a spread angle of the light L1 is suppressed by the first reflection part <NUM>, and thus the entrance NA of the light L1 passing through the light passing part <NUM> may be increased to increase sensitivity, and the length of an optical path from a dispersive part <NUM> to a light detection part <NUM> may be further decreased to further miniaturize the spectrometer 1B. In addition, in the spectrometer 1D, the space S is airtightly sealed by a package 60B that accommodates a light detection element <NUM> and a support <NUM>. In this way, it is possible to suppress a decrease in detection accuracy resulting from deterioration of a member in the space S due to moisture, occurrence of condensation in the space S due to a decrease in ambient temperature, etc..

As illustrated in <FIG>, in a spectrometer of <FIG> and a spectrometer of <FIG>, light L1 passing through a light passing part <NUM> directly enters a dispersive part <NUM>, and light L2 dispersed and reflected by the dispersive part <NUM> directly enters a light detection part <NUM>. In a spectrometer of <FIG>, the light L1 passing through the light passing part <NUM> is reflected by a first reflection part <NUM> and a second reflection part <NUM> in sequence, and enters the dispersive part <NUM>, and the light L2 dispersed and reflected by the dispersive part <NUM> directly enters the light detection part <NUM>. In the spectrometer of <FIG>, the radius of curvature of an inner surface 34a on which the dispersive part <NUM> is formed is <NUM>. In the spectrometer of <FIG>, the radius of curvature of the inner surface 34a on which the dispersive part <NUM> is formed is <NUM>. In the spectrometer of <FIG>, the radius of curvature of the inner surface 34a on which the first reflection part <NUM> and the dispersive part <NUM> are formed is <NUM>.

First, the spectrometer of <FIG> and the spectrometer of <FIG> are compared. The height (height in a Z-axis direction) of the spectrometer of <FIG> is lower than the height of the spectrometer of <FIG> since a distance at which the dispersive part <NUM> concentrates the light L2 on the light detection part <NUM> becomes shorter as the radius of curvature of the inner surface 34a on which the dispersive part <NUM> is formed becomes smaller.

However, as the radius of curvature of the inner surface 34a on which the dispersive part <NUM> is formed is made smaller, various problems occur as below. That is, a focus line of the light L2 (a line connecting positions on which the light L2 having different wavelengths is concentrated) is easily distorted. In addition, influence of various aberrations becomes great, and thus there is difficulty in making correction by designing a grating. Further, in particular, the angle of diffraction to a long wavelength side becomes excessive, and thus a grating pitch needs to be narrowed. However, when the grating pitch becomes narrow, there is difficulty in forming a grating. Furthermore, blazing is necessary to increase sensitivity. However, when the grating pitch is narrowed, there is difficulty in blazing. In addition, in particular, the angle of diffraction to the long wavelength side becomes excessive, and thus it is disadvantageous in terms of resolving power of the light L2.

The above-mentioned various problems occur since it is practical to configure the light passing part <NUM> such that the light L1 passes in a direction perpendicular to surfaces 24a and 24b of a substrate <NUM> of a light detection element <NUM> when the light passing part <NUM> is provided as a slit on the substrate <NUM>. In addition, the problems occur since there is a restriction that zero-order light L0 should be reflected on the opposite side to the light detection part <NUM> side.

On the other hand, in the spectrometer of <FIG>, even though the radius of curvature of the inner surface 34a on which the first reflection part <NUM> and the dispersive part <NUM> are formed is <NUM>, the height of the spectrometer of <FIG> is lower than the height of the spectrometer of <FIG> since an incident direction of the light L1 entering the dispersive part <NUM> and a divergence or convergence state of the light L1 may be adjusted using the first reflection part <NUM> and the second reflection part <NUM> in the spectrometer of <FIG>.

As described in the foregoing, it is practical to configure the light passing part <NUM> such that the light L1 passes in the direction perpendicular to the surfaces 24a and 24b of the substrate <NUM> of the light detection element <NUM> when the light passing part <NUM> is provided as a slit on the substrate <NUM>. In this case, when the first reflection part <NUM> and the second reflection part <NUM> are used, miniaturization of the spectrometer may be attempted. In the spectrometer of <FIG>, the fact that the zero-order light L0 can be captured by a zero-order light capture part <NUM> which is positioned between the second reflection part <NUM> and the light detection part <NUM> is a great feature in attempting miniaturization of the spectrometer while suppressing a decrease in detection accuracy of the spectrometer.

First, a spectrometer will be examined. Here, as illustrated in <FIG>, the spectrometer adopts an optical path that reaches a light detection part <NUM> from a light passing part <NUM> via a first reflection part <NUM>, a dispersive part <NUM>, and a second reflection part <NUM> in sequence. In the spectrometer of <FIG>, light L1 is dispersed and reflected by the dispersive part <NUM> which is a planar grating. Then, light L2 dispersed and reflected by the dispersive part <NUM> is reflected by the second reflection part <NUM> which is a concave mirror, and enters the light detection part <NUM>. In this case, respective rays of the light L2 enter the light detection part <NUM> such that positions, on which the respective rays of the light L2 are concentrated, are close to one another.

In the spectrometer of <FIG>, when a wavelength range of detected light L2 is attempted to be widened, the radius of curvature of the inner surface 34a on which the dispersive part <NUM> is formed and a distance between the second reflection part <NUM> and the light detection part <NUM> need to be increased. Further, since the respective rays of the light L2 enter the light detection part <NUM> such that positions, on which the respective rays of the light L2 are concentrated, are close to one another, the radius of curvature of the inner surface 34a and the distance between the second reflection part <NUM> and the light detection part <NUM> need to be increased. When a distance between the positions, on which the respective rays of the light L2 are concentrated, is excessively widened by narrowing a grating pitch (a distance between grating grooves), there is difficulty in adjusting a focus line of the light L2 to the light detection part <NUM>. In this way, the optical path, which reaches the light detection part <NUM> from the light passing part <NUM> via the first reflection part <NUM>, the dispersive part <NUM>, and the second reflection part <NUM> in sequence, can be regarded as an unfit optical path for miniaturization.

On the other hand, as illustrated in <FIG>, in the spectrometer that adopts an optical path that reaches the light detection part <NUM> from the light passing part <NUM> via the first reflection part <NUM>, the second reflection part <NUM>, and the dispersive part <NUM> in sequence (that is, a spectrometer corresponding to the spectrometers 1A to 1D described above), respective rays of light L2 enter the light detection part <NUM> such that positions, on which the respective rays of the light L2 are concentrated, are separated from one another. Therefore, the optical path that reaches the light detection part <NUM> from the light passing part <NUM> via the first reflection part <NUM>, the second reflection part <NUM>, and the dispersive part <NUM> in sequence can be regarded as a suitable optical path for miniaturization. The above description can be understood from the fact that the radius of curvature of the inner surface 34a is <NUM>, and the height (height in the Z-axis direction) is about <NUM> in the spectrometer of <FIG> while the radius of curvature of the inner surface 34a is <NUM>, and the height is <NUM> in the spectrometer of <FIG>.

Hereinbefore, the first to fourth embodiments of the invention have been described. However, the invention is not restricted to the above respective embodiments. For example, even though the entrance NA of the light L1 entering the space S is defined by the shapes of the light passing part <NUM> of the light detection element <NUM> and the light transmitting opening 52a of the light shielding film <NUM> (the light transmitting opening 53a of the light shielding film <NUM> depending on cases) in the first and second embodiments, the entrance NA of the light L1 entering the space S may be practically defined by adjusting a shape of a region of at least one of the first reflection part <NUM>, the second reflection part <NUM>, and the dispersive part <NUM>. The light L2 entering the light detection part <NUM> is diffracted light, and thus the entrance NA may be practically defined by adjusting a shape of a predetermined region in which the grating pattern 41a is formed in the molded layer <NUM>.

In addition, even though the terminal <NUM> of the light detection element <NUM> and the end part 13a of the wiring <NUM> opposing each other are connected to each other by the bump <NUM> in the above respective embodiments, the terminal <NUM> of the light detection element <NUM> and the end part 13a of the wiring <NUM> opposing each other may be connected to each other by soldering. Further, the terminal <NUM> of the light detection element <NUM> and the end part 13a of the wiring <NUM> opposing each other may be connected to each other on the end surface 33a of each side wall part <NUM> of the support <NUM> rather than only on the end surface 32a of each side wall part <NUM> of the support <NUM>. Alternatively, the terminal <NUM> and the end part 13a may be connected to each other on the end surface 32a of each side wall part <NUM> and the end surface 33a of each side wall part <NUM> of the support <NUM>. Furthermore, in the spectrometers 1A and 1B, the wiring <NUM> may be enclosed on a surface on the opposite side from the space S side in the support <NUM>. In addition, in the spectrometers 1C and 1D, the wiring <NUM> may be enclosed on a surface on the space S side in the support <NUM>.

In addition, the material of the support <NUM> is not restricted to ceramic, and another molding material, for example, resin such as LCP, PPA, and epoxy, and glass for molding may be used as the material. Further, the package 60B may have a shape of a rectangular parallelepiped box. Furthermore, when the space S is airtightly sealed by the package 60B that accommodates the light detection element <NUM> and the support <NUM>, the support <NUM> may have a plurality of pillar parts or a plurality of side wall parts separated from one another in place of the pair of side wall parts <NUM> and the pair of side wall parts <NUM> which surround the space S. In this way, materials and shapes of respective components of the spectrometers 1A to 1D are not restricted to the above-described materials and shapes, and various materials and shapes may be applied thereto.

In addition, in the spectrometers 1A, 1B, 1C, and 1D, the light L1 passing through the light passing part <NUM> may be directly let into the dispersive part <NUM>, and the light L2 dispersed and reflected by the dispersive part <NUM> may be directly let into the light detection part <NUM> without using the first reflection part <NUM> and the second reflection part <NUM>. Even in this case, it is possible to sufficiently miniaturize the dispersive part while suppressing a decrease in detection accuracy of the spectrometer.

In addition, the end part 13b of the wiring <NUM> may be positioned in the region around the depression <NUM> on the surface 31a of the base wall part <NUM> when viewed in a thickness direction of the base wall part <NUM> (that is, the Z-axis direction). In this case, it is possible to inhibit the dispersive part <NUM> from being deformed due to an external force acting on the end part 13b of the wiring <NUM>.

The invention can provide a spectrometer which can attempt miniaturization while suppressing a decrease in detection accuracy, and a method for manufacturing a spectrometer capable of easily manufacturing such a spectrometer.

Claim 1:
A spectrometer (<NUM>) comprising:
a light detection element (<NUM>) having a substrate (<NUM>) made of a semiconductor material, a light passing part (<NUM>) provided in the substrate (<NUM>), and a light detection part (<NUM>) put in the substrate (<NUM>);
a support (<NUM>) having a base wall part (<NUM>) opposing the light detection element (<NUM>) through a space between the light passing part (<NUM>) and the light detection part (<NUM>), and side wall parts (<NUM>, <NUM>) integrally formed with the base wall part (<NUM>), the light detection element (<NUM>) being fixed to the side wall parts, the support (<NUM>) being provided with a wiring (<NUM>) electrically connected to the light detection part (<NUM>); and
a dispersive part (<NUM>) provided on a first surface of the base wall part (<NUM>) on a side of the space and configured to disperse and reflect light passing through the light passing part (<NUM>) to the light detection part (<NUM>) in the space, wherein
a first end part (13a) of the wiring (<NUM>) on a side of the light detection part (<NUM>) is connected to a terminal (<NUM>) provided in the light detection element (<NUM>), and
a second end part (13b) of the wiring (<NUM>) on an opposite side from the side of the light detection part (<NUM>) is positioned on a surface (31b) of the support (<NUM>) on an opposite side from the side of the space,
wherein, by the first end part (13a) being provided on an end surface (32a) of the side wall parts (<NUM>, <NUM>) and being connected to the terminal (<NUM>) provided in the light detection element (<NUM>), the light detection element (<NUM>) is fixed to the side wall parts (<NUM>, <NUM>) so as to oppose the first surface of the base wall part (<NUM>), and
by the light detection element (<NUM>) being fixed to the side wall parts (<NUM>, <NUM>), the space with an optical path from the light passing part (<NUM>) to the light detection part (<NUM>) and the electrical connection of the wiring (<NUM>) to the light detection part (<NUM>) is provided.