CN112711114A

CN112711114A - Lens device

Info

Publication number: CN112711114A
Application number: CN201910950973.4A
Authority: CN
Inventors: 林国泉
Original assignee: Sintai Optical Shenzhen Co Ltd; Asia Optical Co Inc
Current assignee: Sintai Optical Shenzhen Co Ltd; Asia Optical Co Inc
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2021-04-27

Abstract

The present invention relates to a lens apparatus including: a lens module having an optical axis along a first direction; the light path turning module is used for receiving light rays incident along a second direction and reflecting the light rays to the lens module along a first direction; an imaging module; and a prism module disposed between the lens module and the imaging module and including a first prism unit including: a first surface from which light is incident to the first prism unit; the second surface is opposite to the imaging module, and light rays are totally reflected in the first prism unit and are emitted from the second surface; and a third face.

Description

Lens device

Technical Field

The present invention relates to a lens apparatus.

Background

Many portable electronic devices are currently provided with a lens apparatus therein. Fig. 1 is a schematic structural diagram of a lens device 100 in the prior art. As shown in fig. 1, the lens device 100 includes an optical path turning module 101, a lens module 102, and an imaging module 103, wherein the lens module 102 includes a plurality of lens units (not shown) and has an optical axis along a first direction X. The optical path turning module 101, the lens module 102, and the imaging module 103 are arranged along a first direction X. The light is incident to the light path turning module 101 along the second direction Y, reflected by the light path turning module 101 and then incident to the lens module 102 along the first direction X, and then reaches the imaging module 103 along the first direction X and is imaged. Wherein the second direction Y is perpendicular to the first direction X.

The lens device 100 has a drawback in that the optical path turning module 101, the lens module 102, and the imaging module 103 are arranged along the first direction X, and as the zoom ratio of the lens device 100 is increased, an Effective Focal Length (EFL) of the lens device is increased, which results in an increase in Length of the lens device 100, and thus presents a great challenge to a limited space inside the portable electronic device. As portable electronic devices continue to develop, the lens device 100 is required to have a new layout to adapt to the internal layout of the portable electronic devices.

Disclosure of Invention

The present invention is directed to a lens device having a novel layout, which overcomes the above-mentioned drawbacks of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a lens device is constructed including: a lens module having an optical axis along a first direction; the light path turning module is used for receiving light rays incident along a second direction and reflecting the light rays to the lens module along a first direction; an imaging module; and a prism module disposed between the lens module and the imaging module and including a first prism unit including: a first surface from which light is incident to the first prism unit; the second surface is opposite to the imaging module, and light rays are totally reflected in the first prism unit and are emitted from the second surface; and a third face.

According to the lens device of the present invention, the first surface and the lens module are opposite to each other, and the second surface receives light incident from the first surface and reflects the light to the third surface; the third surface receives light reflected from the second surface and reflects the light to the first surface, and the light is reflected on the first surface and then exits from the second surface.

According to the lens device, the second surface is obliquely arranged towards the lens module, and the third surface is plated with the reflecting film.

According to the lens device, the first surface is perpendicular to the first direction, the first surface and the second surface form an angle of 45 degrees, the second surface and the third surface form an angle of 67.5 degrees, and the first surface and the third surface form an angle of 67.5 degrees.

According to the lens apparatus of the present invention, the prism module further includes a second prism unit including: a fourth surface opposite to the lens module; and a fifth surface opposite to the first surface with an air gap therebetween.

According to the lens device, the third surface is plated with the reflecting film and is obliquely arranged towards the direction of the lens module, and the third surface receives the light rays incident from the first surface and reflects the light rays to the first surface; the light rays are reflected on the first surface and then exit from the second surface.

According to the lens device of the present invention, the fourth surface is perpendicular to the first direction.

According to the lens device of the present invention, the second surface is perpendicular to the third surface, the first surface and the second surface form an angle of 50 degrees, the first surface and the third surface form an angle of 40 degrees, the fourth surface and the fifth surface form an angle of 30 degrees, and the fifth surface and the sixth surface form an angle of 60 degrees.

According to the lens apparatus of the present invention, the imaging module includes an imaging unit, and the imaging unit is disposed in parallel with the second surface.

According to the lens apparatus of the present invention, the lens module includes: a lens unit; a lens unit holder; a lens unit main carrier carrying the lens unit; a lens unit sub-carrier for accommodating the lens unit main carrier and connected in the lens unit holder, wherein the lens unit main carrier is movable in at least one of a first direction, a second direction and a third direction relative to the lens unit sub-carrier, and the lens unit sub-carrier is movable in the remaining direction of the first direction, the second direction and the third direction except the at least one direction relative to the lens unit holder; the lens device also comprises a driving piece which drives the lens unit main carrier to move relative to the lens unit auxiliary carrier and drives the lens unit auxiliary carrier to move relative to the lens unit fixing seat.

The lens device has the following beneficial effects: the layout is different from that in the prior art, and the development of electronic equipment can be flexibly adapted.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic structural diagram of a lens device in the prior art;

fig. 2 is a schematic structural view of a lens apparatus according to a first embodiment of the present invention;

fig. 3 is an exploded schematic view of a lens apparatus according to a first embodiment of the present invention;

fig. 4 is a schematic optical path diagram of a lens apparatus according to a first embodiment of the present invention;

fig. 5 is a schematic structural view of a lens apparatus according to a second embodiment of the present invention;

fig. 6 is an exploded schematic view of a lens apparatus according to a second embodiment of the present invention;

fig. 7 is a top view of a lens apparatus according to a second embodiment of the present invention;

fig. 8 is a schematic optical path diagram of a lens apparatus according to a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 2 is a schematic structural diagram of a lens apparatus 200 according to a first embodiment of the present invention; fig. 3 is an exploded schematic view of a lens apparatus 200 according to a first embodiment of the present invention; fig. 4 is a schematic optical path diagram of the lens apparatus 200 according to the first embodiment of the present invention. As shown in fig. 2-4, in the first embodiment of the present invention, the lens device 200 includes an optical path turning module 201, a lens module 202, a prism module 203, and an imaging module 204, wherein the lens module 202 includes a plurality of lens units (not shown) and has an optical axis along the first direction X.

The optical path turning module 201, the lens module 202, and the prism module 203 are arranged along the first direction X. The light is incident to the light path turning module 201 along the second direction Y, is reflected by the light path turning module 201, is incident to the lens module 202 along the first direction X, and then reaches the prism module 203 along the first direction X. Wherein the second direction Y is perpendicular to the first direction X.

The light path turning module 201 includes a light path turning unit base 2011, a light path turning unit carrier (not shown) disposed in the light path turning unit base 2011, and a light path turning unit 2012 fixed in the light path turning unit carrier. The optical path turning unit 2012 may be, for example, a prism unit or a mirror, and has a reflecting surface for reflecting the light incident along the second optical axis Y toward the lens module 202 via the reflecting surface.

The lens module 202 includes: a lens unit holder 2021; a lens unit having an optical axis along a first direction X; a lens unit main carrier carrying the lens unit; a lens unit sub-carrier for accommodating the lens unit main carrier and connected in the lens unit holder 2021, wherein the lens unit main carrier is movable in at least one of the first direction X, the second direction Y, and the third direction Z with respect to the lens unit sub-carrier, and the lens unit sub-carrier is movable in the remaining one of the first direction X, the second direction Y, and the third direction Z except the at least one direction with respect to the lens unit holder 2021; the lens module 202 further comprises a drive (not shown) for driving the lens unit main carrier to move relative to the lens unit sub-carrier and the lens unit sub-carrier to move relative to the lens unit holder 2021, thereby achieving focusing in the first direction X and vibration compensation in the second direction Y and the third direction Z. The third direction Z is perpendicular to the first direction X and the second direction Y.

However, the present invention is not limited thereto, and the lens module 202 may only achieve focusing in the first direction X and vibration compensation in the second direction Y or the third direction Z. I.e. its vibration compensation may be in one direction only.

The prism module 203 is disposed between the lens module 202 and the imaging module 204, and includes a first prism unit 2031 and a prism unit holder (not shown) that holds the first prism unit 2031. Wherein the first prism unit 2031 includes a first surface 2031a, a second surface 2031b, and a third surface 2031 c. The first prism unit 2031 may be, for example, a triangular prism. The first surface 2031a and the lens module 202 are opposite to each other, and the second surface 2031b and the imaging module 204 are opposite to each other.

The light emitted from the lens module 202 is incident into the first prism unit 2031 through a first surface 2031a, preferably, the first surface 2031a is perpendicular to the first direction X, and the light is incident into the first surface 2031 a. The second surface 2031b is inclined toward the lens module 202, and light incident into the first prism unit 2031 is incident on the second surface 2031b and is already greater than a critical angle on the second surface 2031b and thus is totally reflected. The third surface 2031c may be coated with a reflective film, and light reflected by the second surface 2031b is incident on the third surface 2031c and is reflected by the reflective film on the third surface 2031 c. The light reflected by the third surface 2031c is incident on the first surface 2031a and is already greater than the critical angle and thus is totally reflected on the first surface 2031 a. Then, the light reflected by the first surface 2031a exits from the second surface 2031b, reaches the imaging module 204, and is imaged by the imaging module 204, and preferably, the light reflected by the first surface 2031a is perpendicularly incident on the second surface 2031 b. Wherein the first surface 2031a and the second surface 2031b are formed according to Snell's Law, refraction occurs when a light wave travels from one medium to another medium having a different refractive index, if the incident angle of light from a medium with a larger refractive index into a medium with a smaller refractive index exceeds the critical angle, the light will not refract any more but will be totally reflected back to the original sparse medium, that is, there is no refraction light but only Reflection light, i.e. Total Reflection phenomenon (Total Reflection), the critical angle is the minimum incident angle for promoting Total Reflection, the light satisfying the Total Reflection angle will be directly totally reflected without penetration, by using this characteristic, the light of the first surface 2031a enters along the first direction X, the light reflected by the third surface 2031c is incident on the first surface 2031a without penetrating but with total reflection, and the light incident through the first surface 2031a in the first direction X is totally reflected on the second surface 2031 b. The first prism unit 2031 may be a total reflection prism.

Preferably, the first surface 2031a is perpendicular to the first direction X, the second surface 2031b forms an angle of 45 degrees with the first surface 2031a, the second surface 2031b forms an angle of 67.5 degrees with the third surface 2031c, and the first surface 2031a forms an angle of 67.5 degrees with the third surface 2031c, so as to ensure that the light can travel along the above-mentioned route. The invention is not limited thereto and other suitable angles may be used.

The imaging module 204 includes an imaging unit 2041, and the imaging unit 2041 is disposed in parallel with the second face 2031 b.

Fig. 5 is a schematic structural diagram of a lens apparatus 300 according to a second embodiment of the present invention; fig. 6 is an exploded schematic view of a lens apparatus 300 according to a second embodiment of the present invention; fig. 7 is a top view of a lens apparatus 300 according to a second embodiment of the present invention; fig. 8 is a schematic optical path diagram of a lens apparatus 300 according to a second embodiment of the present invention. As shown in fig. 5-8, in the second embodiment of the present invention, the lens device 300 includes an optical path turning module 301, a lens module 302, a prism module 303, and an imaging module 304, wherein the lens module 302 includes a plurality of lens units (not shown) and has an optical axis along the first direction X.

The optical path turning module 301, the lens module 302, and the prism module 303 are arranged along the first direction X. The light is incident to the light path turning module 301 along the second direction Y, reflected by the light path turning module 301 and then incident to the lens module 302 along the first direction X, and then reaches the prism module 303 along the first direction X. Wherein the second direction Y is perpendicular to the first direction X.

The optical path turning module 301 includes an optical path turning unit base 3011, an optical path turning unit carrier (not shown) disposed in the optical path turning unit base 3011, and an optical path turning unit 3012 fixed in the optical path turning unit carrier. The optical path-turning unit 3012 may be, for example, a prism unit or a mirror, and has a reflection surface for reflecting light incident along the direction of the second optical axis Y toward the lens module 302 via the reflection surface.

The lens module 302 includes: a lens unit holder 3021; a lens unit having an optical axis along a first direction X; a lens unit main carrier carrying the lens unit; a lens unit sub-carrier for accommodating the lens unit main carrier and connected in the lens unit holder 3021, wherein the lens unit main carrier is movable in at least one of the first direction X, the second direction Y, and the third direction Z with respect to the lens unit sub-carrier, and the lens unit sub-carrier is movable in the remaining one of the first direction X, the second direction Y, and the third direction Z except for the at least one direction with respect to the lens unit holder 3021; the lens module 302 further comprises a driving member (not shown) for driving the lens unit main carrier to move relative to the lens unit sub-carrier and the lens unit sub-carrier to move relative to the lens unit fixing base 3021, thereby realizing focusing in the first direction X and vibration compensation in the second direction Y and the third direction Z. The third direction Z is perpendicular to the first direction X and the second direction Y.

However, the present invention is not limited thereto, and the lens module 302 may implement only focusing in the first direction X and vibration compensation in the second direction Y or the third direction Z. I.e. its vibration compensation may be in one direction only.

The prism module 303 includes a first prism unit 3031, a second prism unit 3032, and a prism unit holder (not shown) that fixes the first prism unit 3031 and the second prism unit 3032. The first prism unit 3031 includes a first surface 3031a, a second surface 3031b, and a third surface 3031 c. The second prism unit 3032 includes a fourth face 3032a, a fifth face 3032b, and a sixth face. The first and

second prism units

3031 and 3032 may be, for example, triangular prisms.

Wherein the fourth surface 3032a and the lens module 302 are opposite to each other, and the fifth surface 3032b and the first surface 3031a are parallel and opposite to each other with an air gap, which may be 0.01 mm. The second face 3031b and the imaging module 304 are opposite to each other.

The light emitted from the lens module 302 enters the second prism unit 3032 through the fourth surface 3032a and is emitted from the fifth surface 3032 b. Then, the light beam emitted from the fifth surface 3032b passes through the air gap and enters the first prism unit 3031 from the first surface 3031 a. The third surface 3031c is obliquely disposed toward the lens module 302 and may be coated with a reflective film thereon, and light incident into the first prism unit 3031 is incident on the third surface 3031c and reflected on the third surface 3031c by the reflective film. The light reflected by the third surface 3031c is incident on the first surface 3031a, and is already greater than the critical angle and thus is totally reflected on the first surface 3031 a. Thereafter, the light reflected by the first face 3031a exits from the second face 3031b, reaches the imaging module 304, and is imaged by the imaging module 304. Wherein the first surface 3031a is based on Snell's Law, which is a phenomenon in which a light wave is refracted when it travels from one medium to another medium having a different refractive index, if the incident angle of light from a medium with a larger refractive index into a medium with a smaller refractive index exceeds the critical angle, the light will not refract any more but will be totally reflected back to the original sparse medium, that is, there is no refraction light and only there is Reflection light, that is, there is Total Reflection phenomenon (Total Reflection), the critical angle is the minimum incident angle for promoting the Total Reflection, the light satisfying the Total Reflection angle will be directly totally reflected without penetration, by using this characteristic, the light which exits from the fifth surface 3032b and enters into the first prism unit 3031 from the first surface 3031a after passing through the air gap, the light reflected by the third surface 3031c is incident on the first surface 3031a without being transmitted but is totally reflected. The first prism unit 3031 may be a total reflection prism.

Preferably, the fourth face 3032a is perpendicular to the first direction X, and the second face 3031b is perpendicular to the third face 3031 c. The first face 3031a may be at an angle of, for example, 50 degrees to the second face 3031b, the first face 3031a may be at an angle of, for example, 40 degrees to the third face 3031c, the fourth face 3032a may be at an angle of, for example, 30 degrees to the fifth face 3032b, and the fifth face 3032b may be at an angle of, for example, 60 degrees to the sixth face. The invention is not limited thereto and other suitable angles may be used.

The imaging module 304 includes an imaging unit 3041, and the imaging unit 3041 is arranged in parallel with the second face 3031 b.

The lens device has a layout different from that in the prior art, and can be more flexibly adapted to the development of electronic equipment.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A lens apparatus, comprising:

a lens module having an optical axis along a first direction;

the light path turning module is used for receiving light rays incident along a second direction and reflecting the light rays to the lens module along a first direction;

an imaging module; and

a prism module disposed between the lens module and the imaging module and including a first prism unit including: a first surface from which light is incident to the first prism unit; the second surface is opposite to the imaging module, and light rays are totally reflected in the first prism unit and are emitted from the second surface; and a third face.

2. The lens device according to claim 1, wherein the first face and the lens module are opposed to each other, and the second face receives light incident from the first face and reflects the light to the third face; the third surface receives light reflected from the second surface and reflects the light to the first surface, and the light is reflected on the first surface and then exits from the second surface.

3. The lens device according to claim 2, wherein the second surface is disposed obliquely toward the lens module, and the third surface is coated with a reflective film.

4. The lens device as claimed in claim 2, wherein the first surface is perpendicular to the first direction, the first surface and the second surface form an angle of 45 degrees, the second surface and the third surface form an angle of 67.5 degrees, and the first surface and the third surface form an angle of 67.5 degrees.

5. The lens device according to claim 1, wherein the prism module further includes a second prism unit including: a fourth surface opposite to the lens module; and a fifth surface opposite to the first surface with an air gap therebetween.

6. The lens device according to claim 5, wherein the third surface is coated with a reflective film and is disposed obliquely toward the lens module, the third surface receiving light incident from the first surface and reflecting the light to the first surface; the light rays are reflected on the first surface and then exit from the second surface.

7. The lens device according to claim 6, wherein the fourth face is perpendicular to the first direction.

8. The lens device according to claim 6, wherein the second surface is perpendicular to the third surface, the first surface is at an angle of 50 degrees to the second surface, the first surface is at an angle of 40 degrees to the third surface, the fourth surface is at an angle of 30 degrees to the fifth surface, and the fifth surface is at an angle of 60 degrees to the sixth surface.

9. The lens device according to claim 1, wherein the imaging module includes an imaging unit that is disposed in parallel with the second face.

10. The lens device according to claim 1, wherein the lens module includes: a lens unit; a lens unit holder; a lens unit main carrier carrying the lens unit; a lens unit sub-carrier for accommodating the lens unit main carrier and connected in the lens unit holder, wherein the lens unit main carrier is movable in at least one of a first direction, a second direction and a third direction relative to the lens unit sub-carrier, and the lens unit sub-carrier is movable in the remaining direction of the first direction, the second direction and the third direction except the at least one direction relative to the lens unit holder; the lens device also comprises a driving piece which drives the lens unit main carrier to move relative to the lens unit auxiliary carrier and drives the lens unit auxiliary carrier to move relative to the lens unit fixing seat.