Patent Description:
With the continuous development of augmented reality technology, augmented reality wearable devices such as augmented reality glasses and other terminal devices are rapidly emerging. In augmented reality glasses, an optical assembly is arranged in front of the user's eyes to provide an augmented reality scene effect. In order to improve the experience of a terminal user, the structural design of the optical assembly needs to be more and more elaborated. In order to be used conveniently, the optical assembly part must be adapted to the eyes of different people by adjusting its position, so that the virtual imaging can be displayed just in front of the glasses to improve the wearing experience of the user.

In order to conveniently use the augmented reality glasses, and adjust the position of the optical assembly so that the user can obtain a better augmented reality scene effect, there is a need for an optical assembly structure that can be adjusted conveniently, to improve the user experience and promote the products.

Examples of prior art can be found in <CIT> and <CIT>.

With respect to the problem of the convenient adjustment of augmented reality glasses in the prior art, the present disclosure provides a pair of augmented reality glasses to solve the problem or at least partially solve the problem.

The invention is disclosed in the appended independent claims.

In order to achieve the object, the present disclosure adopts the following technical solutions:
A pair of augmented reality glasses comprising a main body of glasses and an optical assembly connected with the main body of glasses, wherein the optical assembly is arranged on an outer side of the main body of glasses, at least one end of the optical assembly is rotationally connected with a leg of the main body of glasses, and the optical assembly rotates with damping with respect to the leg.

The optical assembly is an L-shaped structure comprising a first component and a second component; the first component is connected in a rotational and damped way with the leg, and is arranged along an outer side of the leg; the second component comprises an optical element which is arranged along a lens adjacent to the leg.

Optionally, the first component is connected in a rotational and damped way with the leg through a connecting portion, and the connecting portion comprises a first rotating shaft, a first rubber ring, a first pressing gasket, an anti-loose gasket, a second rubber ring and a fastening screw;
the first rotating shaft is fixed to an outer side of the first component, a shaft hole is formed in the leg, and the first rotating shaft passes through the shaft hole and sequentially passes through the first rubber ring, the first pressing gasket, an anti-loose gasket and a second rubber ring; the fastening screw is screwed into a tail end of the first rotating shaft in its axial direction, and tightly locks the first rubber ring, the first pressing gasket, the anti-loose gasket and the second rubber ring.

Optionally, the first component is connected in a rotational and damped way with the leg through a connecting portion, and the connecting portion comprises a first rotating shaft, a rubber ring and a first butterfly-shaped clamping gasket; the first rotating shaft is fixed to an outer side of the first component, a shaft hole is formed in the leg, and the first rotating shaft passes through the shaft hole, and sequentially passes through the rubber ring and the first butterfly-shaped clamping gasket; and a first clamping buckle is arranged at a tail end of the first rotating shaft, and the first butterfly-shaped clamping gasket tightly clamps the first clamping buckle and tightly locks the rubber ring.

The first component further comprises a rotating portion, and the rotating portion divides the first component into a front section and a rear section; the front section is connected with the second component, the rear section is connected in a rotational and damped way with an outer sidewall of the leg, and the front section and the rear section are connected in a rotational and damped way through the rotating portion.

Optionally, the rotating portion comprises a rotating connecting member and a second rotating shaft; the second rotating shaft is fixed on the front section; the rotating connecting member is sleeved on the second rotating shaft and engages with an interference fit with the second rotating shaft; a tail end of the rotating connecting member is fixedly connected with the rear section; and a limiting structure is arranged between the second rotating shaft and the rotating connecting member, and the limiting structure restricts the rotating connecting member to rotate around the second rotating shaft in a predetermined range.

Optionally, the rotating portion comprises: a second rotating shaft, a first rotating shaft component, a second rotating shaft component, a spring, a second pressing gasket and a second butterfly-shaped clamping gasket; the first rotating shaft component and the second rotating shaft component are respectively fixed on the rear section and the front section; the first rotating shaft component and the second rotating shaft component are both provided with a shaft hole; the second rotating shaft passes through the shaft hole of the first rotating shaft component and the shaft hole of the second rotating shaft component, and sequentially passes through the spring, the second pressing gasket and the second butterfly-shaped clamping gasket; a second clamping buckle is arranged at a tail end of the second rotating shaft, and the second butterfly-shaped clamping gasket tightly clamps the second clamping buckle to fasten the first rotating shaft component, the second rotating shaft component, the spring and the second pressing gasket; and the contacting surface between the first rotating shaft component and the second rotating shaft component is a damping friction surface.

Optionally, the rotating portion comprises a second rotating shaft and a clamping structure; the second rotating shaft is fixed on the rear section, and the clamping structure is fixed on the front section; the clamping structure comprises a plurality of clamping claws, and all of the plurality of clamping claws clamp the second rotating shaft, and engage with an interference fit with the second rotating shaft; and the second rotating shaft and/or the clamping claws are made of a self-lubricating material.

Optionally, the rotating portion comprises a second rotating shaft and a silicone sliding groove; the second rotating shaft is fixed on the front section, and the silicone sliding groove is formed in the rear section; the silicone sliding groove comprises a plurality of shaft holes which are communicated; the second rotating shaft passes through one of the shaft holes of the silicone sliding groove, and engages with the shaft hole with an interference fit; and the second rotating shaft is capable of sliding along the silicone sliding groove under the action of an external force, and engaging with any one of the shaft holes with an interference fit.

Optionally, further comprising: two parallel silicone sliding grooves; the second rotating shaft passes through shaft holes of the two silicone sliding grooves which are aligned with each other, and engages with the shaft holes with an interference fit.

Optionally, the length of the pair of augmented reality glasses is smaller than or equal to <NUM>, the width of the pair of augmented reality glasses is smaller than or equal to <NUM>, and the length of the leg is smaller than or equal to <NUM>.

Optionally, a mass of the pair of augmented reality glasses is smaller than or equal to <NUM>.

In conclusion, the advantageous effects of the present disclosure are as follows.

In the pair of augmented reality glasses according to the present disclosure, the optical assembly is arranged on an outer side of the main body of glasses, and at least one end of the optical assembly is connected in a rotational and damped way with a leg of the main body of glasses, so that the optical assembly can rotate with damping with respect to the leg, thereby the position of the optical assembly in the up and down directions in front of the eyes can be conveniently adjusted in the rotating range to accurately match the augmented reality image with the sight line and obtain a better augmented reality experience.

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure are further described in detail below with reference to the accompanying drawings.

The inventive concept of the present disclosure is as follows. The optical assembly is connected with the outer side of the main body of glasses in a rotational and damped way, so that the position of the augmented reality image can be adjusted by rotating the optical assembly, in order to better adapt to the head size and the eye position of different wearers, and enhance the augmented reality experience of the wearer.

<FIG> is a top view of a pair of augmented reality glasses according to the present disclosure. <FIG> is a side view of a pair of augmented reality glasses according to the present disclosure.

The pair of augmented reality glasses according to the present disclosure, as shown in <FIG>, comprises a main body of glasses <NUM> and an optical assembly <NUM>. The optical assembly <NUM> is connected with the main body of glasses <NUM>, and is arranged on an outer side of the main body of glasses <NUM>. The outer side of the main body of glasses <NUM> is the side of the main body of glasses <NUM> which is opposite to the head of the user, when the main body of glasses <NUM> is worn. At least one end of the optical assembly <NUM> is rotationally connected with either leg of the main body of glasses <NUM>, and the optical assembly <NUM> rotates with damping with respect to the leg.

As shown in the top view of <FIG>, an end of the optical assembly <NUM> is connected with the outer side of the leg of the main body of glasses <NUM>, and the optical assembly <NUM> can rotate in the direction perpendicular to the plane of the paper. Thereby, when the user wears the pair of augmented reality glasses, the optical assembly <NUM> can be adjusted up and down in front of the eyes, so that the augmented reality image provided by the optical assembly <NUM> is accurately matched with the sight line. For example, <FIG> is a schematic diagram showing that the optical assembly <NUM> rotates downward from a position (<NUM>) to a position (<NUM>).

In some embodiments of the present disclosure, the optical assembly <NUM> may have more than one end connected with the main body of glasses <NUM>. For example, the optical assembly <NUM> may have a structure extending across two lenses, and two ends of the optical assembly <NUM> are connected with two legs respectively.

In some embodiments of the present disclosure, the optical assembly <NUM> has an L-shaped structure comprising a first component <NUM> and a second component <NUM>, as shown in <FIG>. The first component <NUM> is connected in a rotational and damped way with a leg and is arranged along an outer side of the leg. The second component <NUM> comprises an optical element, and the optical element is arranged along a lens adjacent to the leg. The optical element is used for providing an augmented reality scene effect to a user, and may comprise optical lenses such as prisms, and may also comprise a transparent or semitransparent display, which is not limited in detail herein.

<FIG> depicts one structure for connecting an optical assembly and a main body of glasses shown in the first embodiment of the present disclosure. As shown in <FIG>, the first component <NUM> is connected in a rotational and damped way with a leg through a connecting portion, and the connecting portion comprises a first rotating shaft <NUM>, a first rubber ring <NUM>, a first pressing gasket <NUM>, an anti-loose gasket <NUM>, a second rubber ring <NUM> and a fastening screw <NUM>.

The first rotating shaft <NUM> is fixed to an outer side of the first component <NUM>, and a shaft hole is formed at a leg of the main body of glasses <NUM>. The first rotating shaft <NUM> passes through the shaft hole of the leg, and sequentially passes through the first rubber ring <NUM>, the first pressing gasket <NUM>, the anti-loose gasket <NUM> and the second rubber ring <NUM>. The fastening screw <NUM> is screwed into the tail end of the first rotating shaft <NUM> along its axial direction, and a first rubber ring <NUM>, a first pressing gasket <NUM>, an anti-loose gasket <NUM> and a second rubber ring <NUM> are tightly locked. Due to the fastening force provided by the fastening screw <NUM>, a friction force is generated when a component such as the first rotating shaft <NUM> rotates, thereby producing a damping effect.

The first pressing gasket <NUM> is a planar metal gasket and is used for providing a sealing effect, and it has a high strength and a long service life. The anti-loose gasket <NUM> is a metal gasket with a screw thread or a conical surface, and is used for preventing the fastening screw <NUM> from loosening. The first rubber ring <NUM> is located between the main body of glasses <NUM> and the first pressing gasket <NUM>, and the second rubber ring <NUM> is located between the anti-loose gasket <NUM> and the fastening screw <NUM>. The first rubber ring <NUM> and the second rubber ring <NUM> can provide elasticity, and also can prevent the gasket made of metal from rubbing with the main body of glasses <NUM> or the fastening screw <NUM> and generating noise. Thus, silent and rotary tuning may be realized, and the service life of the first rotating shaft <NUM> is also prolonged.

<FIG> depicts another structure for connecting the optical assembly and the main body of glasses shown in the second embodiment of the present disclosure.

As shown in <FIG>, the first component <NUM> is connected in a rotational and damped way with a leg through a connecting portion, and the connecting portion comprises a first rotating shaft <NUM>, a rubber ring <NUM> and a first butterfly-shaped clamping gasket <NUM>. The first rotating shaft <NUM> is fixed to an outer side of the first component <NUM>. A shaft hole is formed in a leg. The first rotating shaft <NUM> passes through the shaft hole and sequentially passes through the rubber ring <NUM> and the first butterfly-shaped clamping gasket <NUM>. A first clamping buckle <NUM> is arranged at the tail end of the first rotating shaft <NUM>. The first butterfly-shaped clamping gasket <NUM> tightly clamps the first clamping buckle <NUM>, and tightly locks the rubber ring <NUM>.

In the second embodiment, the optical assembly <NUM> is rotationally connected with the leg of the main body of glasses <NUM> through a first rotating shaft <NUM>. Due to the existence of the rubber ring <NUM>, a damping rotation is formed between the optical assembly <NUM> and the leg under the action of the elasticity and the friction force of the rubber ring <NUM>, and the hand feeling of the rotary adjustment is comfortable. By means of the damping force, the optical assembly <NUM> can stop at any position when being rotated to adapt to the eye positions of different users, and provide a good augmented reality experience.

<FIG> depicts a first structure for connecting a front section and a rear section of the optical assembly shown in the third embodiment of the present disclosure. <FIG> is a cross-sectional view of the optical assembly shown in <FIG>.

As shown in <FIG>, the first component <NUM> further comprises a rotating portion, and the rotating portion divides the first component <NUM> into a front section <NUM> and a rear section <NUM> (see <FIG>). The front section <NUM> is connected with the second component <NUM>, and the rear section <NUM> is connected in a rotational and damped way with an outer sidewall of a leg. The front section <NUM> and the rear section <NUM> are connected in a rotational and damped way through the rotating portion.

As shown in <FIG>, the rotating portion between the front section <NUM> and the rear section <NUM> comprises a second rotating shaft <NUM> and a rotating connecting member <NUM>. The second rotating shaft <NUM> is fixed on the front section <NUM>. The rotating connecting member <NUM> sleeves on the second rotating shaft <NUM>, and engages with the second rotating shaft <NUM> with an interference fit. A tail end of the rotating connecting member <NUM> is fixedly connected with the rear section <NUM>. A limiting structure is arranged between the second rotating shaft <NUM> and the rotating connecting member <NUM>. The limiting structure restricts the rotating connecting member <NUM> to rotate around the second rotating shaft <NUM> in a predetermined range.

In some embodiments of the present disclosure, the rotating connecting member <NUM> can be formed by sheet metal manufacturing process or metal injection forming process. The rotating connecting member <NUM> and the second rotating shaft <NUM> engage with an interference fit to produce a damping effect. The second rotating shaft <NUM> is tightly locked on the front section <NUM> through a screw <NUM>. The rotating connecting member <NUM> is tightly locked on the rear section <NUM> through a screw <NUM>.

In some embodiments of the present disclosure, the limiting structure provided between the second rotating shaft <NUM> and the rotating connecting member <NUM> can be realized by a shaft shoulder on the second rotating shaft <NUM>.

<FIG> depicts a second structure for connecting a front section and a rear section of an optical assembly shown in the fourth embodiment of the present disclosure. <FIG> is a cross-sectional view of the optical assembly shown in <FIG>.

As shown in <FIG> and <FIG>, the rotating portion between the front section <NUM> and the rear section <NUM> of the optical assembly <NUM> comprises: a second rotating shaft <NUM>, a first rotating shaft component <NUM>, a second rotating shaft component <NUM>, a spring <NUM>, a second pressing gasket <NUM> and a second butterfly-shaped clamping gasket <NUM>. The first rotating shaft component <NUM> and the second rotating shaft component <NUM> are fixed on the rear section <NUM> and the front section <NUM> respectively. The first rotating shaft component <NUM> and the second rotating shaft component <NUM> are both provided with a shaft hole. The second rotating shaft <NUM> passes through the shaft hole of the first rotating shaft component <NUM> and the shaft hole of the second rotating shaft component <NUM>, and sequentially passes through the spring <NUM>, the second pressing gasket <NUM> and the second butterfly-shaped clamping gasket <NUM>. A second clamping buckle <NUM> is arranged at a tail end of the rotating shaft <NUM>. The second butterfly-shaped clamping gasket <NUM> tightly clamps the second clamping buckle <NUM>, so as to fasten the first rotating shaft component <NUM>, the second rotating shaft component <NUM>, the spring <NUM> and the second pressing gasket <NUM>. The contacting surface between the first rotating shaft component <NUM> and the second rotating shaft component <NUM> forms a damping friction surface.

Threaded holes are formed in the first rotating shaft component <NUM> and the second rotating shaft component <NUM>. The first rotating shaft component <NUM> is fixed on the rear section <NUM> through a screw <NUM> passing through the threaded hole. The second rotating shaft component <NUM> is fixed on the front section <NUM> through the screw <NUM> and the screw <NUM>. The second rotating shaft <NUM> sequentially passes through the shaft hole of the first rotating shaft component <NUM>, the shaft hole of the second rotating shaft component <NUM>, the spring <NUM> and the second pressing gasket <NUM>. The second clamping buckle <NUM> at the end of the second rotating shaft <NUM> and the second butterfly-shaped clamping gasket <NUM> are clamped together and locked tightly. Under the action of the elastic force of the spring <NUM>, the first rotating shaft component <NUM> and the second rotating shaft component <NUM> are pressed together. During rotation adjustment, a damping effect is achieved by the frictional resistance between the first rotating shaft component <NUM> and the second rotating shaft component <NUM>.

<FIG> depicts a third structure for connecting a front section and a rear section of an optical assembly shown in the fifth embodiment of the present disclosure.

As shown in <FIG>, the rotating portion between the front section <NUM> and the rear section <NUM> comprises a second rotating shaft <NUM> and a clamping structure <NUM>. The second rotating shaft <NUM> is fixed on the rear section <NUM>. The clamping structure <NUM> is fixed on the front section <NUM>, and comprises a plurality of clamping claws <NUM>. In the embodiment shown in <FIG>, the number of the clamping claws <NUM> is two, but the number of the clamping claws <NUM> is not limited thereto, and more clamping claws <NUM> may be provided to increase the tightness of the clamping. The plurality of clamping claws <NUM> all clamp the second rotating shaft <NUM>, and engage with the second rotating shaft <NUM> with an interference fit. The second rotating shaft <NUM> and/or the clamping claws <NUM> are made of a self-lubricating material.

The clamping structure <NUM> and the rotating shaft <NUM> are assembled in a clamped manner, so the operation is convenient and simple. In addition, at least one of the second rotating shaft <NUM> and the clamping claws <NUM> are made of a self-lubricating material, so the damping rotation adjustment can be smoother, and the hand feeling in operation is comfortable.

By designing the first component <NUM> of the optical assembly <NUM> as a sectional structure and taking advantage of the relative rotation between the front section <NUM> and the rear section <NUM>, the adjustable range of the augmented reality image can be further enlarged.

<FIG> is another side view of a pair of augmented reality glasses according to the present disclosure. The side view shows a schematic diagram when the front section <NUM> is rotated downward with respect to the rear section <NUM>, and the position is adjusted from the position (<NUM>)' to the position (<NUM>)'.

<FIG> is a schematic diagram of the adjustable angle range of a pair of augmented reality glasses according to the present disclosure. The schematic diagram shows a two-stage rotation adjustment between the main body of glasses <NUM> and the optical assembly <NUM>, and between the front section <NUM> and the rear section <NUM> of the optical assembly <NUM>.

The pair of augmented reality glasses according to the present disclosure adopts a two-stage rotating shaft rotation adjustment which comprise: a first-stage rotating shaft rotation adjustment between the main body of glasses <NUM> and the optical assembly <NUM>, and a second-stage rotating shaft rotation adjustment between the front section <NUM> and the rear section <NUM> of the optical assembly <NUM>. As shown in <FIG>, when the optical assembly <NUM> is kept in a straightened state, it is adjusted through a first-stage rotating shaft rotation adjustment, so that the optical element can be freely adjusted between the limit positions indicated by A and B.

In some embodiments, after being adjusted through the first-stage rotating shaft rotation adjustment, it may be further adjusted through the second-stage rotating shaft rotation adjustment to continue to perform an accurate and fine adjustment of the augmented reality image position. For example, at the limit position indicated by A, the optical element can be freely adjusted between the positions indicated by C1 and C2 through the second-stage rotating shaft rotation adjustment. At the limit position indicated by B, the optical element can be freely adjusted between the positions indicated by D1 and D2 through the second-stage rotating shaft rotation adjustment.

The angle range of the first-stage rotating shaft rotation adjustment is φ. For example, the angle range of adjustment is φ = <NUM>° in <FIG>. Additionally, by means of the second-stage rotating shaft rotation adjustment, the adjustable angle range can be further enlarged, namely, from the original angle range A-B to the angle range C1-D1. Thus, in the wearing process, the user can perform a rough adjustment through the first-stage rotating shaft rotation adjustment, and then perform an accurate and fine adjustment through the second-stage rotating shaft rotation adjustment after adjusting to an approximate position, so that the augmented reality image reaches a better position which can meet the requirement of the user.

<FIG> depicts a fourth structure for connecting a front section and a rear section of the optical assembly shown in the sixth embodiment of the present disclosure. <FIG> is a cross sectional view of a silicone sliding groove of <FIG>. <FIG> is a top view of a pair of augmented reality glasses shown in the sixth embodiment of the present disclosure.

In the sixth embodiment, the front section <NUM> and the rear section <NUM> of the optical assembly <NUM> cannot only perform a rotation adjustment as shown in <FIG>, but also perform a sliding adjustment. As shown in <FIG>, the rotating portion between the front section <NUM> and the rear section <NUM> comprises a second rotating shaft <NUM> and a silicone sliding groove <NUM>. The second rotating shaft <NUM> is fixed on the front section <NUM> through a screw <NUM>. The silicone sliding groove <NUM> is formed on the rear section <NUM>. The silicone sliding groove <NUM> is formed by a plurality of shaft holes <NUM> which are communicated. As shown in <FIG>, in the silicone sliding groove <NUM>, each arc corresponds to a shaft hole <NUM>. The second rotating shaft <NUM> passes through one of the shaft holes <NUM> of the silicone sliding groove <NUM>, and engages with the shaft hole <NUM> with an interference fit. Thereby, the damping rotation connection between the front section <NUM> and the rear section <NUM> is realized, so that the front section <NUM> can rotate with respect to the rear section <NUM> according to the curved arrow in <FIG>, and the rotation adjustment of the augmented reality image is realized.

In some embodiments, the second rotating shaft <NUM> is capable of sliding along the silicone sliding groove <NUM> under the action of an external force. It slides into any one of the shaft holes <NUM> and engages with the shaft hole with an interference fit. Thereby, a push-and-pull operation along the direction indicated by the hollow arrow in <FIG> can be realized, so that the front section <NUM> slides with respect to the rear section <NUM>, and the sliding adjustment of the augmented reality image is realized.

In some embodiments, two parallel silicone sliding grooves <NUM> are provided. The second rotating shaft <NUM> passes through the shaft holes <NUM> of the two silicone sliding grooves <NUM> which are aligned with each other, and engages with the shaft holes <NUM> with an interference fit. By providing two parallel silicone sliding grooves <NUM> to engage with the second rotating shaft <NUM>, the second rotating shaft <NUM> can be prevented from swinging, and the stability of rotation adjustment is improved. Of course, the number of the silicone sliding grooves <NUM> is not limited thereto, and more silicone sliding grooves may be provided, which is not described in detail herein.

In some embodiments, the silicone sliding groove <NUM> and the plastic shell of the rear section <NUM> are manufactured by a double-material injection process, by which the two materials, namely, silicone and plastic, can be combined firmly, and thus the pair of augmented reality glasses of the present embodiment will have a long service life.

As shown in the top view of <FIG>, when being worn, the optical element arranged on the second component <NUM> provides an augmented reality image. In the plane of the paper, the adjustment of the augmented reality image in the left and right directions of the eyes can be realized by pushing and pulling the front section <NUM>. In the direction perpendicular to the paper, the adjustment of the augmented reality image in the up and down directions in front of the eyes can be realized by rotating the rear section <NUM> of the optical assembly <NUM> with respect to the main body of glasses <NUM>, and rotating the front section <NUM> of the optical assembly <NUM> with respect to the rear section <NUM>.

In the embodiments of the present disclosure, the length of the pair of augmented reality glasses is smaller than or equal to <NUM>, the width of the pair of augmented reality glasses is smaller than or equal to <NUM>, and the length of the leg of the pair of augmented reality glasses is smaller than or equal to <NUM>.

In the embodiments of the present disclosure, a mass of the pair of augmented reality glasses is smaller than or equal to <NUM>, to meet the light weight requirement of the glasses and improve the wearing comfort.

Claim 1:
A pair of augmented reality glasses comprising a main body of glasses (<NUM>) and an optical assembly (<NUM>) connected with the main body of glasses (<NUM>), wherein the optical assembly (<NUM>) is arranged on an outer side of the main body of glasses (<NUM>), at least one end of the optical assembly (<NUM>) is rotationally connected with a leg of the main body of glasses (<NUM>), and the optical assembly (<NUM>) rotates with damping with respect to the leg, characterized in that
the optical assembly (<NUM>) is an L-shaped structure comprising a first component (<NUM>) and a second component (<NUM>), the first component (<NUM>) is connected in a rotational and damped way with the leg and is arranged along an outer side of the leg, and the second component (<NUM>) comprises an optical element which is arranged along a lens adjacent to the leg;
the first component (<NUM>) further comprises a rotating portion, and the rotating portion divides the first component (<NUM>) into a front section (<NUM>) and a rear section (<NUM>); the front section (<NUM>) is connected with the second component (<NUM>), the rear section (<NUM>) is connected in a rotational and damped way with an outer sidewall of the leg, and the front section (<NUM>) and the rear section (<NUM>) are connected in a rotational and damped way through the rotating portion;
when the first component (<NUM>) rotates with respect to the leg in up and down directions of a user's eyes, a first stage rotation adjustment of the optical assembly with the whole first component (<NUM>) as the radius is formed; when the front section (<NUM>) of the first component (<NUM>) rotates with respect to the rear section (<NUM>) of the first component (<NUM>) in up and down directions of a user's eyes, a second stage rotation adjustment of the optical assembly with the front section (<NUM>) of the first component (<NUM>) as the radius is formed.