Patent Description:
As an image processing device, an image forming device which forms an image on a sheet is used. The image forming device includes a sensor unit (apparatus) which detects a presence of a person. The sensor unit is required to prevent a decrease in detection sensitivity. The sensor unit is required to be able to adjust a detection range.

<CIT> discloses a power-supply monitoring device, wherein a detection section detects, in a predetermined region, a body capable of movement including a user who intends to use a processing section. When the body capable of movement is detected, a determination section determines whether switching from a power saving mode to a power supply mode is to be performed. The detection range can be changed using different masks, mounted on guide rails so as to allow placement of one mask in front of an infrared sensor.

<CIT> discloses a passive infrared detector, wherein a masking means at various positions frees or obstructs partially or completely infrared rays following the optical paths from an arc lens assembly to a pyro sensor.

<CIT> discloses a human-body detector, wherein a lens array in front of an infrared sensor has a plurality of first lenses that condense infrared light on a thermal-type infrared detecting element. A heat-insulating cover covers the infrared sensor and has a second lens that condenses infrared light incident from the lens array side on the thermal-type infrared detecting element.

<CIT> discloses a pyroelectric infrared sensor including at least a sensor element, a sensor element supporter for supporting the sensor element and a circuit board. In the pyroelectric infrared sensor, an optical filter and a compound lens are arranged above the sensor element, and the optical sensor has a lens effect.

<CIT> discloses an image forming apparatus including an image forming apparatus main body and a pyroelectric sensor that detects presence of a person based on light received from the periphery of the image forming apparatus main body, wherein the pyroelectric sensor is rotatably mounted to the image forming apparatus main body, to change the detection range.

<CIT> discloses an operator detection method, an operator detecting device, and an image forming apparatus, wherein the operator detection area is vertically adjustable, by using a screw and leaf-spring mechanism to tilt an infrared sensor.

One of the objects of the present invention is to improve prior art techniques and overcome at least some of the prior problems as for instance above illustrated.

According to a first aspect of the present invention, it is provided an image processing device, comprising: an image processor configured to process an image; a controller configured to control power supplied to the image processor based on an output signal of a photosensitive sensor; and a sensor apparatus, the sensor apparatus, comprising: the photosensitive sensor including a first lens, and a second lens which focus on a photosensitive element; a cover having a first slit arranged on an optical axis of the first lens and a second slit arranged on an optical axis of the second lens; and a moving mechanism configured to relatively move the photosensitive sensor and the cover so that the second slit is arranged on the optical axis of the first lens. The first lens and the second lens are arranged side by side in a circumferential direction of a horizontal axis, the horizontal axis being parallel to a width direction of an image processing device. The moving mechanism is configured to pivot the photosensitive sensor around the horizontal axis to move the photosensitive sensor to a first detection state and a second detection state. In the first detection state, the first slit is arranged on the optical axis of the first lens and the second slit is arranged on the optical axis of the second lens. In the second detection state, the second slit is arranged on the optical axis of the first lens.

Optionally, in the apparatus according to the first aspect of the invention, the photosensitive sensor further includes a third lens, wherein the first lens, the second lens, and the third lens are arranged side by side in a circumferential direction of the horizontal axis, the cover further includes a third slit which may be located on an optical axis of the third lens, the moving mechanism is configured to move the photosensitive sensor so that in the second detection state, the second slit is arranged on the optical axis of the first lens and the third slit is arranged on the optical axis of the second lens, and the moving mechanism is configured to move the photosensitive sensor so that in a third detection state, the third slit is arranged on the optical axis of the first lens, wherein the moving mechanism is configured to pivot the photosensitive sensor between the second detection state and the third detection state, the second detection state having a greater detection range than the third detection state.

Optionally, in the apparatus according to the first aspect of the invention, an inner surface of the first slit is formed along an angle of view of the first lens, the inner surface of the first slit arranged so that the optical axis passes through the first slit in the first state, the inner surface of the second slit is formed along an angle of view of the second lens, the inner surface of the second slit arranged so that the optical axis passes through the second slit in the first state, and an inner surface of the third slit is formed along an angle of view of the third lens, the inner surface of the third slit arranged so that the optical axis passes through the third slit in the first state.

Optionally, in the apparatus according to the first aspect of the invention, the moving mechanism includes a lever configured to pivot the photosensitive sensor around the horizontal axis.

Optionally, in the apparatus according to the first aspect of the invention, the cover has a flat plate shape.

Optionally, in the apparatus according to the first aspect of the invention, a surface of the cover is perpendicular to the optical axis of the photosensitive sensor.

Optionally, in the apparatus according to the first aspect of the invention, the photosensitive sensor includes a pyroelectric sensor.

Optionally, in the apparatus according to the first aspect of the invention, the photosensitive element includes two photosensitive elements arranged side by side in a plane perpendicular to the photosensitive sensor optical axis.

Optionally, in the apparatus according to the first aspect of the invention, the optical axis of the second lens coincides with the photosensitive sensor optical axis.

An object to be solved by an exemplary embodiment is to provide a sensor unit (apparatus) and an image processing device (processor) capable of preventing a decrease in detection sensitivity and adjusting a detection range.

A sensor unit of at least one embodiment includes a photosensitive sensor, a cover, and a moving mechanism. The photosensitive sensor includes a first lens and a second lens which focus on a photosensitive element. The cover includes a first slit arranged on an optical axis of the first lens and a second slit arranged on an optical axis of the second lens. The moving mechanism is configured to move the photosensitive sensor and the cover relative to each other so that the second slit is arranged on the optical axis of the first lens.

Hereinafter, a sensor unit and an image processing device of at least one embodiment will be described with reference to the drawings.

<FIG> is a front view of the image processing device of at least one embodiment. In the present application, a Z direction, an X direction, and a Y direction of the Cartesian coordinate system are defined as follows. The Z direction is a vertical direction and a +Z direction is an upward direction. The X and Y directions are horizontal. The X direction is a width direction of an image forming device. A +X direction is to a right direction with respect to the image forming device. The Y direction is a depth direction of the image forming device. The +Y direction is a direction from the front to the back of the image forming device. A θ direction is a circumferential direction in the X direction. A +θ direction is a rotation direction of a right-hand screw traveling in the X direction.

The image processing device of at least one embodiment is an image forming device <NUM>. The image forming device <NUM> performs a process of forming an image on a sheet. The sheet may be paper. The image forming device <NUM> includes a control panel <NUM>, a scanner portion <NUM>, an image processing unit, a sheet supply portion <NUM>, and a controller <NUM>.

The control panel <NUM> includes an operation unit and a display portion. The operation unit is provided with various keys, a touch panel, and the like, and accepts user operations. The display portion displays various types of information.

The scanner portion <NUM> reads image information of an object to be copied based on brightness and darkness of light and generates an image signal.

The image processing unit of at least one embodiment may be an image forming unit <NUM>. The image forming unit <NUM> forms a toner image based on an image signal from the scanner portion <NUM> or the outside. A toner image is an image formed of toner or other material. The image forming unit <NUM> transfers the toner image onto the surface of the sheet. The image forming unit <NUM> includes a fixing device <NUM>. The fixing device <NUM> heats and pressurizes the toner image transferred to the sheet to fix the toner image on the sheet.

The sheet supply unit <NUM> supplies the sheets one by one to the image forming unit <NUM> at the timing at which the image forming unit <NUM> forms the toner image.

<FIG> is a block diagram of the image processing device.

The image forming device <NUM> includes a central processing unit (CPU) <NUM>, a memory <NUM>, an auxiliary storage device <NUM>, and the like connected by a bus, and executes a program. The image forming device <NUM> functions as a device including the control panel <NUM>, the scanner unit <NUM>, the image forming unit <NUM>, the sheet supply unit <NUM>, and the like by executing a program.

The CPU <NUM> functions as the controller <NUM> by executing a program stored in the memory <NUM> and the auxiliary storage device <NUM>. The controller <NUM> controls the operation of each functional unit of the image forming device <NUM>.

The auxiliary storage device <NUM> is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The auxiliary storage device <NUM> stores information.

A sensor unit (apparatus) <NUM> will be described.

The image forming device <NUM> includes the sensor unit <NUM> illustrated in <FIG>. The sensor unit <NUM> is located at a predetermined height in the +Z direction from the floor surface. For example, the sensor unit <NUM> is located at the corners of the image forming device in the -X direction and the -Y direction. The sensor unit <NUM> detects a person existing in a vicinity of the image forming device <NUM>.

<FIG> illustrates a first state of the sensor unit of the embodiment and is a side cross-sectional view taken along the line III-III of <FIG>. The sensor unit <NUM> includes a photosensitive sensor <NUM> illustrated in <FIG>, a cover <NUM>, and a moving mechanism <NUM> illustrated in <FIG>.

The photosensitive sensor <NUM> includes a photosensitive unit E and a lens unit L illustrated in <FIG>.

The photosensitive unit E detects light rays. The photosensitive unit E includes a plurality of photosensitive elements <NUM> and <NUM>. The plurality of photosensitive elements <NUM> and <NUM> are arranged side by side in a plane perpendicular to an optical axis <NUM> of the photosensitive sensor <NUM>. The photosensitive sensor <NUM> may be a pyroelectric sensor. The pyroelectric sensor includes pyroelectric elements as the photosensitive elements <NUM> and <NUM>. The pyroelectric element uses the pyroelectric effect to detect infrared rays emitted by a person. The pyroelectric effect is a phenomenon in which the electric charge of a ferroelectric substance increases or decreases due to a temperature change caused by infrared rays. If the photosensitive unit E detects light rays, the photosensitive unit E outputs a detection signal.

The lens unit L focuses the incident light rays on the photosensitive unit E. The lens unit L collects the incident light rays on the photosensitive unit E. The lens unit L includes a plurality of lenses <NUM>, <NUM>, and <NUM>. The plurality of lenses <NUM>, <NUM>, and <NUM> are the first lens <NUM>, the second lens <NUM>, and the third lens <NUM>. The plurality of lenses <NUM>, <NUM>, and <NUM> may be arranged side by side in a circumferential direction of a horizontal axis H. The horizontal axis H is parallel to the X direction and passes through the surface of the photosensitive unit E. The first lens <NUM>, the second lens <NUM>, and the third lens <NUM> are arranged side by side in this order from the +Z direction to the -Z direction.

The optical axis <NUM> of the photosensitive sensor <NUM> is orthogonal to the X direction and intersects the horizontal axis H. In the first state of the sensor unit <NUM> illustrated in <FIG>, the optical axis <NUM> of the photosensitive sensor <NUM> is inclined by an angle a from the -Y direction to the +θ direction. Optical axes <NUM>, <NUM>, and <NUM> of the plurality of lenses <NUM>, <NUM>, and <NUM> are orthogonal to the X direction and intersect the horizontal axis H. The second optical axis <NUM> of the second lens <NUM> coincides with the optical axis <NUM> of the photosensitive sensor <NUM>. The first optical axis <NUM> of the first lens <NUM> is inclined by an angle b in the -θ direction from the second optical axis <NUM>. The third optical axis <NUM> of the third lens <NUM> is inclined by the angle b in the +θ direction from the second optical axis <NUM>. The angle a and the angle b are the same. In the first state of the sensor unit <NUM> illustrated in <FIG>, the first optical axis <NUM> is parallel to the Y direction.

The moving mechanism <NUM> illustrated in <FIG> pivotably supports the photosensitive sensor <NUM> around the horizontal axis H. The moving mechanism <NUM> includes a lever <NUM>. The lever <NUM> is exposed to the outside of the image forming device <NUM>. The lever <NUM> is connected to the photosensitive sensor <NUM>. If the lever <NUM> pivots in the θ direction, the photosensitive sensor <NUM> pivots in the θ direction. The moving mechanism <NUM> is configured to pivot the photosensitive sensor <NUM> around the horizontal axis H.

The cover <NUM> is located between the outside of the image forming device <NUM> and the photosensitive sensor <NUM> illustrated in <FIG>. The cover <NUM> prevents the action of an external force on the photosensitive sensor <NUM> and protects the photosensitive sensor <NUM>. The cover <NUM> is a part of the housing of the image forming device <NUM>. The cover <NUM> may have a flat plate shape and is parallel to the X direction. A normal line <NUM> on the surface of the cover <NUM> is inclined by the angle a from the -Y direction to the +θ direction. In the first state of the sensor unit <NUM> illustrated in <FIG>, the optical axis <NUM> of the photosensitive sensor <NUM> coincides with the normal line <NUM> on the surface of the cover <NUM>.

The cover <NUM> has a plurality of slits <NUM>, <NUM>, and <NUM>. The plurality of slits <NUM>, <NUM>, and <NUM> penetrate the cover <NUM> in a thickness direction. The plurality of slits <NUM>, <NUM>, and <NUM> are long in the X direction and short in the Y direction. The plurality of slits <NUM>, <NUM>, and <NUM> are the first slit <NUM>, the second slit <NUM>, and the third slit <NUM>. In the first state of the sensor unit <NUM> illustrated in <FIG>, the plurality of slits <NUM>, <NUM>, and <NUM> are respectively located on the optical axes <NUM>, <NUM>, and <NUM> of the plurality of lenses <NUM>, <NUM>, and <NUM>. The first slit <NUM> is located on the first optical axis <NUM>. The second slit <NUM> is located on the second optical axis <NUM>. The third slit <NUM> is located on the third optical axis <NUM>. In other words, the optical axes <NUM>, <NUM>, and <NUM> of the plurality of lenses <NUM>, <NUM>, and <NUM> respectively pass through the plurality of slits <NUM>, <NUM>, and <NUM>. The first optical axis <NUM> passes through the first slit <NUM>. The second optical axis <NUM> passes through the second slit <NUM>. The third optical axis <NUM> passes through the third slit <NUM>.

<FIG> is a cross-sectional view taken along the line IV-IV of <FIG>. As illustrated in <FIG> and <FIG>, the inner surfaces of the plurality of slits <NUM>, <NUM>, and <NUM> are formed along the ends of the angles of view of the plurality of lenses <NUM>, <NUM>, and <NUM> in the first state. In the first state, as illustrated in <FIG>, the plurality of lenses <NUM>, <NUM>, and <NUM> are arranged so that the optical axes <NUM>, <NUM>, and <NUM> pass through the plurality of slits <NUM>, <NUM>, and <NUM>. The ends of the angles of view of the plurality of lenses <NUM>, <NUM>, and <NUM> are the optical paths farthest from the optical axes <NUM>, <NUM>, and <NUM> among the optical paths of light rays incident on the photosensitive unit E through the plurality of lenses <NUM>, <NUM>, and <NUM>.

The inner surface of the first slit <NUM> is formed along the end of the angle of view of the first lens <NUM> in the first state. The inner surface of the second slit <NUM> is formed along the end of the angle of view of the second lens <NUM> in the first state. The inner surface of the third slit <NUM> is formed along the end of the angle of view of the third lens <NUM> in the first state. The inner surfaces of the plurality of slits <NUM>, <NUM>, and <NUM> intersect at angles other than perpendicular to the surface of cover <NUM>.

The plurality of slits <NUM>, <NUM>, and <NUM> do not limit the angles of view of the plurality of lenses <NUM>, <NUM>, and <NUM>. The incident light rays on the photosensitive sensor <NUM> are not limited by the plurality of slits <NUM>, <NUM>, and <NUM>. Such configuration prevents a decrease in the detection sensitivity of the photosensitive sensor <NUM>. The set of optical paths of light rays incident on the photosensitive unit E through the plurality of lenses <NUM>, <NUM>, and <NUM> is the detection ranges <NUM>, <NUM>, and <NUM> by the plurality of lenses <NUM>, <NUM>, and <NUM>. The plurality of slits <NUM>, <NUM>, and <NUM> do not limit the detection ranges <NUM>, <NUM>, and <NUM> by the plurality of lenses <NUM>, <NUM>, and <NUM>.

Since the plurality of slits <NUM>, <NUM>, and <NUM> are elongated, human fingers may have difficulty in entering. Such a configuration prevents a decrease in detection sensitivity due to contamination of the photosensitive sensor <NUM>. Since the plurality of slits <NUM>, <NUM>, and <NUM> are elongated, the action of an external force on the photosensitive sensor <NUM> is prevented. Such configuration improves the reliability of the photosensitive sensor <NUM>.

<FIG> is an explanatory diagram of the detection range of the sensor unit in the first state. The sensor unit <NUM> detects a person who is near the image forming device <NUM> as a person who may use the image forming device <NUM>. The sensor unit <NUM> detects a person existing in the detection ranges <NUM>, <NUM>, and <NUM>. In the first state, the first optical axis <NUM> is parallel to the Y direction. The first detection range <NUM> by the first lens <NUM> extends to infinity, but a first detection distance Da is determined by the detection sensitivity of the photosensitive unit E. The detection distance is the distance from the photosensitive sensor <NUM> within which the photosensitive sensor <NUM> can perform detection. If a person is within the range of the first detection distance Da, the photosensitive sensor <NUM> outputs a detection signal.

In the first state, the second optical axis <NUM> and the third optical axis <NUM> are inclined from the -Y direction to the +θ direction. The second detection range <NUM> by the second lens <NUM> and the third detection range <NUM> by the third lens <NUM> are finite ranges. The second detection range <NUM> and the third detection range <NUM> are closer to the image forming device <NUM> than the first detection range <NUM>. The photosensitive sensor <NUM> also outputs a detection signal if a person is in the second detection range <NUM> or the third detection range <NUM>.

As illustrated in <FIG>, the photosensitive sensor <NUM> is connected to the bus. The controller <NUM> controls the power supplied to the image forming unit <NUM> based on the output signal of the photosensitive sensor <NUM>. The power supply mode to the image forming unit <NUM> includes at least a normal mode and a power saving mode. In the normal mode, all power required for image formation is supplied. In the power saving mode, the power supplied to some devices including the fixing device <NUM> is restricted. Even in the power saving mode, power is supplied to the controller <NUM> and the photosensitive sensor <NUM>. If the detection signal of the photosensitive sensor <NUM> is received in the power saving mode, the controller <NUM> switches the power supply mode to a higher normal mode. If the detection signal of the photosensitive sensor <NUM> is received in the normal mode state, the controller <NUM> postpones switching the power supply mode to a lower power saving mode. The power supply mode may be set to three or more stages.

In the first state illustrated in <FIG>, since the first optical axis <NUM> is parallel to the Y direction, the first detection distance Da of the photosensitive sensor <NUM> is long. In the first state, the photosensitive sensor <NUM> also detects a person away from the image forming device <NUM>. By switching the sensor unit <NUM> from the first state, the detection distance of the photosensitive sensor <NUM> changes.

<FIG> is a side cross-sectional view of the sensor unit in the second state. <FIG> is an explanatory diagram of the detection range of the sensor unit in a second state. If the lever <NUM> illustrated in <FIG> pivots, the photosensitive sensor <NUM> pivots to a position of the second state illustrated in <FIG>. In the second state, the second slit <NUM> is arranged on the first optical axis <NUM> and the third slit <NUM> is arranged on the second optical axis <NUM>. In other words, in the second state, the first optical axis <NUM> passes through the second slit <NUM> and the second optical axis <NUM> passes through the third slit <NUM>. The first optical axis <NUM> is inclined from the -Y direction to the +θ direction. As illustrated in <FIG>, the first detection range <NUM> in the second state is a finite range. In the first detection range <NUM>, the position farthest from the image forming device <NUM> in the -Y direction is a second detection distance Db of the photosensitive sensor <NUM>. The second detection distance Db in the second state is shorter than the first detection distance Da. If a person is within the range of the second detection distance Db, the photosensitive sensor <NUM> outputs a detection signal.

In the second state, the second optical axis <NUM> is inclined from the -Y direction to the +θ direction. The second detection range <NUM> is closer to the image forming device <NUM> than the first detection range <NUM>. The photosensitive sensor <NUM> outputs a detection signal even if a person is within the second detection range <NUM>.

<FIG> is a side cross-sectional view of the sensor unit in a third state. <FIG> is an explanatory diagram of the detection range of the sensor unit in the third state. If the lever <NUM> illustrated in <FIG> pivots, the photosensitive sensor <NUM> pivots to the position of the third state illustrated in <FIG>. In the third state, the third slit <NUM> is arranged on the first optical axis <NUM>. In other words, in the third state, the first optical axis <NUM> passes through the third slit <NUM>. The first optical axis <NUM> is inclined from the -Y direction to the +θ direction. As illustrated in <FIG>, the position farthest from the image forming device <NUM> in the -Y direction within the first detection range <NUM> is a third detection distance Dc of the photosensitive sensor <NUM>. The third detection distance Dc in the third state is shorter than the first detection distance Da and the second detection distance Db. If a person is within the range of the third detection distance Dc, the photosensitive sensor <NUM> outputs a detection signal.

As described in detail above, the sensor unit <NUM> of the embodiment includes the photosensitive sensor <NUM>, the cover <NUM>, and the moving mechanism <NUM>. The photosensitive sensor <NUM> includes the first lens <NUM> and the second lens <NUM> which focus on the photosensitive elements <NUM> and <NUM>. The cover <NUM> has the first slit <NUM> arranged on the first optical axis <NUM> of the first lens <NUM> and the second slit <NUM> arranged on the second optical axis <NUM> of the second lens <NUM>. The moving mechanism <NUM> can move the photosensitive sensor <NUM> so that the second slit <NUM> is arranged on the first optical axis <NUM> of the first lens <NUM>.

Since the slits <NUM> and <NUM> are elongated, the photosensitive sensor <NUM> is protected from dirt. Since the incident light rays on the photosensitive sensor <NUM> pass through the slits <NUM> and <NUM>, the attenuation of the incident light rays is prevented. Such configurations prevent the decrease in the detection sensitivity of the photosensitive sensor <NUM>. The moving mechanism <NUM> changes the slit arranged on the first optical axis <NUM>. The detection range of the photosensitive sensor <NUM> differs depending on whether the first optical axis <NUM> passes through the first slit <NUM> or the second slit <NUM>. Such configuration allows the detection range to be adjusted by the photosensitive sensor <NUM>. The detection range can be adjusted with a simple configuration and the cost of the sensor unit is reduced.

The photosensitive sensor <NUM> further includes the third lens <NUM>. The cover <NUM> further has the third slit <NUM> located on the third optical axis <NUM> of the third lens <NUM>. The moving mechanism <NUM> can move the photosensitive sensor <NUM> so that the second slit <NUM> is arranged on the first optical axis <NUM> of the first lens <NUM> and the third slit <NUM> is arranged on the second optical axis <NUM> of the second lens <NUM>. The moving mechanism <NUM> can move the photosensitive sensor <NUM> so that the third slit <NUM> is arranged on the first optical axis <NUM> of the first lens <NUM>.

The moving mechanism <NUM> changes the slit arranged on the first optical axis <NUM>. The detection range of the photosensitive sensor <NUM> differs depending on whether the first optical axis <NUM> passes through the first slit <NUM>, the second slit <NUM>, or the third slit <NUM>. Such configuration allows the detection range of the photosensitive sensor <NUM> to be adjusted.

The first lens <NUM>, the second lens <NUM>, and the third lens <NUM> are arranged side by side in the circumferential direction of the horizontal axis H. The moving mechanism <NUM> is configured to pivot the photosensitive sensor <NUM> around the horizontal axis H.

By pivoting the photosensitive sensor <NUM>, the detection range can be easily adjusted. The first optical axis <NUM> is perpendicular to the horizontal axis H. Due to the pivoting of the photosensitive sensor <NUM>, the first optical axis <NUM> pivots around the horizontal axis H. Such configuration changes the detection range of the photosensitive sensor <NUM> in the direction of approaching or separating from the horizontal axis H of the photosensitive sensor <NUM>.

The inner surface of the first slit <NUM> is formed along the angle of view of the first lens <NUM> arranged so that the first optical axis <NUM> passes through the first slit <NUM>. The inner surface of the second slit <NUM> is formed along the angle of view of the second lens <NUM> arranged so that the second optical axis <NUM> passes through the second slit <NUM>. The inner surface of the third slit <NUM> is formed along the angle of view of the third lens <NUM> arranged so that the third optical axis <NUM> passes through the third slit <NUM>.

Respective slits <NUM>, <NUM>, and <NUM> do not limit the angles of view of the lenses <NUM>, <NUM>, and <NUM>. The incident light rays on the photosensitive sensor <NUM> are not limited by the plurality of slits <NUM>, <NUM>, and <NUM>. Such configuration prevents a decrease in the detection sensitivity of the photosensitive sensor <NUM>.

The image forming device <NUM> of the embodiment includes the sensor unit <NUM>, the image forming unit <NUM>, and the controller <NUM>. The image forming unit <NUM> forms an image. The controller <NUM> controls the power supplied to the image forming unit <NUM> based on the output signal of the photosensitive sensor <NUM>.

The sensor unit <NUM> sensitively detects a presence of a person. The sensor unit <NUM> can adjust the detection range. The controller <NUM> controls the power supplied to the image forming unit <NUM> based on the detection of a person by the photosensitive sensor <NUM>. The image forming device <NUM> can appropriately control the power supplied to the image forming unit <NUM>.

The photosensitive sensor <NUM> of the embodiment includes three lenses <NUM>, <NUM>, and <NUM> and the cover <NUM> has three slits <NUM>, <NUM>, and <NUM>. The numbers of lenses and slits are not limited thereto. The photosensitive sensor <NUM> may include two lenses, or may include four or more lenses. The cover <NUM> may have two slits, or may have four or more slits.

The moving mechanism <NUM> of at least one embodiment pivots the photosensitive sensor <NUM> in a state where the cover <NUM> is fixed. The moving mechanism <NUM> may pivot the cover <NUM> in a state where the photosensitive sensor <NUM> is fixed. The moving mechanism <NUM> may pivot the photosensitive sensor <NUM> and the cover <NUM> in opposite directions to each other. The moving mechanism <NUM> can move the photosensitive sensor <NUM> and the cover <NUM> relative to each other. In other words, the moving mechanism <NUM> is capable of pivoting at least one of the photosensitive sensor <NUM> or the cover <NUM>.

The image processing device of at least one embodiment is the image forming device <NUM> and the image processing unit is the image forming unit <NUM> having the fixing device <NUM>. The image processing device (processor) may be a decoloring device and the image processing unit may be an image decoloring unit including a decoloring portion. The image decoloring unit performs a process of decolorizing the image formed on the sheet with decolorable toner. The decolorizing portion heats and decolorizes the decolorable toner image formed on the sheet passing through a nip.

Claim 1:
An image processing device (<NUM>), comprising:
an image processor configured to process an image;
a controller (<NUM>) configured to control power supplied to the image processor based on an output signal of a photosensitive sensor (<NUM>); and
a sensor apparatus (<NUM>),
characterized in that:
the sensor apparatus (<NUM>) comprises:
the photosensitive sensor (<NUM>) including a first lens (<NUM>), and a second lens (<NUM>) which focus on a photosensitive element (<NUM>,<NUM>); the photosensitive sensor (<NUM>) including an infrared sensor,
a cover (<NUM>) having a first slit (<NUM>) which may be arranged on an optical axis (<NUM>) of the first lens (<NUM>) and a second slit (<NUM>) which may be arranged on an optical axis (<NUM>) of the second lens (<NUM>); and
a moving mechanism (<NUM>) configured to relatively move the photosensitive sensor (<NUM>) and the cover (<NUM>) so that the second slit (<NUM>) is arranged on the optical axis (<NUM>) of the first lens (<NUM>),
characterized in that
the first lens (<NUM>) and the second lens (<NUM>) are arranged side by side in a circumferential direction of a horizontal axis (H), the horizontal axis (H) being parallel to a width direction (X) of the image processing device (<NUM>), and
the moving mechanism (<NUM>) is configured to pivot the photosensitive sensor (<NUM>) around the horizontal axis (H) to move the photosensitive sensor (<NUM>) to a first detection state and a second detection state, wherein the first detection state has a greater detection range than the second detection state,
wherein in the first detection state, the first slit (<NUM>) is arranged on the optical axis (<NUM>) of the first lens (<NUM>) and the second slit (<NUM>) is arranged on the optical axis (<NUM>) of the second lens (<NUM>), and in the second detection state, the second slit (<NUM>) is arranged on the optical axis (<NUM>) of the first lens (<NUM>).