CN215895076U

CN215895076U - Optical system

Info

Publication number: CN215895076U
Application number: CN202120620341.4U
Authority: CN
Inventors: 李佳妮; 若林央; 徐业钏
Original assignee: Shenzhen Bosen Photoelectric Technology Co ltd
Current assignee: Shenzhen Bosen Photoelectric Technology Co ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2022-02-22
Anticipated expiration: 2031-03-26

Abstract

The present invention is intended to provide an optical system that can satisfy high performance and multifunction requirements, has an extremely simple structure, is excellent in assemblability, and can realize high performance based on high-precision assembly. The present invention provides an optical system which is divided into at least three units, wherein the at least three units include a main optical unit, other optical units and a sensor unit, all of the other optical units and the sensor unit are directly connected to the main optical unit, the main optical unit includes a lens chamber with a built-in lens, and at least a part of the other optical units is an optical unit including a lens chamber with a built-in lens.

Description

Optical system

Technical Field

The present invention relates to an optical system, and more particularly to a mechanism of a camera having various mechanisms with a large number of lenses.

Background

As an example of the camera, a product such as a digital camera can be cited. In recent years, as higher performance has been demanded for an imaging optical system for a digital camera and the like, the number of lenses constituting a digital camera has increased, and in addition to the higher performance of the camera, more functions such as auto-focusing, automatic diaphragm adjustment, and vibration prevention, that is, a high-performance and multifunctional camera has been demanded.

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

However, as the number of lenses and various functional mechanisms increase, the entire mechanism of the camera becomes complicated, the assembling property decreases, and it becomes difficult to assemble various members, mechanisms, lenses, and the like with high accuracy, and if the lenses, mechanisms, and the like cannot be assembled with high accuracy, there is a possibility that the high performance thereof cannot be exhibited. Therefore, it is extremely important to provide a structure that can be assembled with high precision and has excellent assemblability while satisfying the above-described requirements.

In view of the above, the present invention provides a mechanism for a camera that can satisfy the requirements of high performance and multiple functions, has an extremely simple structure, is excellent in assemblability, and can realize high performance by assembly with high precision.

Means for solving the problems

In order to solve the above problem, the present invention provides an optical system having the following configurations (1) to (7).

(1) An optical system is decomposed into at least three units including a main optical unit, other optical units, and a sensor section, all of the other optical units and the sensor section being directly joined to the main optical unit, the main optical unit including a lens chamber in which a lens is built, and at least a part of the other optical units being optical units including a lens chamber in which a lens is built.

(2) In the above configuration (1), the main optical unit is a rear group of the optical system, and the optical units of the other optical units are front groups of the optical system.

(3) In the above configuration (2), not only the other optical unit but also a main mechanism portion of the optical system is directly coupled to the main optical unit.

(4) In the above configuration (3), the main mechanism unit is a focus adjustment unit having at least one optical lens and being relatively movable with respect to the main optical unit.

(5) In the above configuration (3), the main mechanism is a diaphragm adjustment device interposed between the other optical unit as a front group and the main optical unit as a rear group.

(6) In addition to the above configuration (4), the focus adjustment unit includes a mechanism holding unit that holds the focus adjustment unit, and a sensor holding unit that holds the sensor unit, which are arranged in parallel.

(7) In addition to the above configuration (5), the optical unit includes a mechanism holding unit that holds the diaphragm adjustment device and an optical holding unit that holds the other optical unit in parallel.

Effect of the utility model

As described above, by directly combining the components of the optical system with a single component, a highly accurate and high-performance optical system can be obtained. Further, by making each unit independent, the assembly work can be performed independently for each unit, and the assembly work and maintenance are extremely easy.

Drawings

Fig. 1 is a perspective view of the imaging optical system of the embodiment in a disassembled state.

Fig. 2 is a sectional view of the image pickup optical system of the embodiment.

Fig. 3 is an explanatory diagram for separating each unit and explaining the relationship of each unit in a cross-sectional view of the imaging optical system of the embodiment.

Fig. 4 is a front view of the diaphragm unit 40.

Fig. 5 is a front view of the focusing unit 60.

Description of the reference numerals

20. Front group unit, 40, diaphragm unit, 0, rear group unit, 60, focus unit, 80, sensor unit, 21, front group lens chamber, 1, rear group lens chamber, 1a, 1b, 21a, 21b, engagement portion, 1d, 1e, 81a, 81b, engagement portion, L1 to L14, lens, 61, focus motor, 62, lens frame, 62a, 1c, screw portion, 81, sensor holder, 82, sensor substrate, 83, sensor, 84, sensor substrate adjustment screw portion, 85, sensor substrate pressing spring, 47, 67, screw, 41, diaphragm motor, 42, gear set, 43, diaphragm driving cam, 43, protrusion, 44, diaphragm blade, 46, PI, 62b, gear, 48, substrate, 63, identification plate, 64, PI, 65, motor gear, 66, focus gear set.

Detailed Description

Hereinafter, an embodiment of the mechanism of the camera according to the present invention will be described in further detail with reference to the drawings.

Fig. 1 shows a typical example of the imaging optical system of the present invention. In fig. 1, the optical system is illustrated as being divided into a plurality of units including at least an optical unit as the front group unit 20, an optical unit as the rear group unit 0, and a sensor unit 80. The rear group unit 0 is a main optical unit, the front group unit 20 is at least a part of other optical units, and units other than the front group unit 20 may be added as necessary as other optical units. The units in the imaging optical system are not limited to the above units, and other units may be added as necessary. Specifically, fig. 1 includes a front group unit 20, a diaphragm unit 40, a rear group unit 0, a focus unit 60, and a sensor unit 80 in this order along the optical axis direction.

Fig. 2 is a sectional view of the photographing optical system of the embodiment. The optical unit as the front group unit 20 includes a front group lens chamber 21, and the front group lens chamber 21 houses a plurality of lenses L1 to L7. The type and number of lenses are not particularly limited, and may be changed according to actual circumstances. The diaphragm unit 40 is disposed adjacent to the front group unit 20, and the diaphragm unit 40 has a diaphragm motor 41, and the diaphragm radius can be changed by the rotational driving of the diaphragm motor 41.

The rear group unit 0 is disposed so as to sandwich the diaphragm unit 40 between the front group unit 20 and the rear group unit 0, the rear group unit 0 includes a rear group lens chamber 1, and the rear group lens chamber 1 houses a plurality of lenses L8 to L13. The type and number of lenses are not particularly limited, and may be changed according to actual circumstances.

In order to ensure optical performance, extremely high precision is required, and for example, it is necessary to control the eccentricity between the lenses in the front group unit and the rear group unit to 5 μm and the tilt angle to within 30 seconds, and if precision is not ensured, the performance of the optical system cannot be exhibited.

As one means for ensuring accuracy, as shown in fig. 2, the rear group lens chamber 1 of the rear group unit 0 extends in the optical axis direction, and has an engagement portion 1a on the inner peripheral wall on the side close to the front group unit 20, and an engagement portion 1b in a part of the end surface of the rear group lens chamber 1 on the side close to the front group unit 20. The front unit 20 has a cylindrical portion and a flange portion projecting from the cylindrical portion at an end portion thereof on the rear unit 0 side. The outer peripheral surface of the cylindrical portion is joined to the inner peripheral portion of the rear group lens chamber 1, and the cylindrical portion has an engaging portion 21a at a portion corresponding to the engaging portion 1 a. The flange portion abuts against an end surface of the rear group lens chamber 1 on the front group unit 20 side, and has an engagement portion 21b at a portion corresponding to the engagement portion 1 b. These engaging portions ensure the accuracy of the combination of the front group unit 20 and the rear group unit 0.

The camera according to the embodiment of the present application further includes a focusing unit 60, and the focusing unit 60 includes a focusing motor 61 and a lens frame 62. The focus motor 61 is incorporated in the focus unit 60, and the lens frame 62 holds the lens L14 and further enables the lens L14 to rotate and move in the optical axis direction. The lens L14 held by the lens frame 62 can be moved by driving the focus motor 61. The lens held in the focusing unit 60 is not limited to the lens L14, and other lenses may be held in addition to the holding lens L14.

The lens frame 62 has a screw portion 62a, and the rear group lens chamber 1 has engagement portions 1d and 1e similar to the engagement portions 1a and 1 b. The engaging portions 1d and 1e and the engaging portions 1a and 1b are integrally formed in the rear group lens chamber 1. The rear group lens chamber 1 has a screw portion 1c at a position corresponding to the screw portion 62a, and the rear group lens chamber 1 and the lens frame 62 are engaged with each other by screwing the screw portion 1c to the screw portion 62 a.

When the focus motor 61 is driven, the lens frame 62 is rotated, and the rotation of the lens frame 62 is converted into movement in the optical axis direction by the screw engagement between the screw portion 62a and the screw portion 1c, whereby the lens L14 is moved in the optical axis direction to perform focus adjustment.

With the above configuration, the front group unit 20 and the rear group unit 0 are combined with high accuracy, and the focusing unit 60 is engaged with the rear group lens chamber 1 of the rear group unit 0 in the same manner, whereby the accuracy of the optical axes of the lens groups L1 to L7 and the focusing lens L14 in the front group unit can be ensured with respect to the lens groups L8 to L13 in the rear group unit.

The aperture motor 41 and the focus motor 61 are parallel to the optical axis, but are provided at symmetrical positions with the rear group lens chamber 1 interposed therebetween, with the output shafts of the two motors being opposite in direction, and thus can be provided in a small space, and the lens barrel can be downsized.

Further, as shown in fig. 2, the mechanism of the camera further includes a sensor unit 80, and the sensor unit 80 includes a sensor holder 81, a sensor substrate 82, a sensor 83, a sensor substrate adjusting screw portion 84, and a sensor substrate pressing spring 85. The sensor is not particularly limited, and examples thereof include sensor elements such as CMOS and CCD, and images are formed on the sensor 83 by the lenses L1 to L14. The sensor substrate adjustment screw portion 84 is used to adjust the inclination of the sensor substrate 82.

As one means for ensuring accuracy, as shown in fig. 2, the rear group lens chamber 1 of the rear group unit 0 extends in the optical axis direction, and has an engaging portion 1d on the outer peripheral wall on the side close to the sensor unit 80 and an engaging portion 1e in a part of the end surface of the rear group lens chamber 1 on the side close to the sensor unit 80. The sensor unit 80 has a cylindrical portion and a flange portion protruding from the cylindrical portion at an end portion thereof on the rear group unit 0 side. The inner peripheral surface of the cylindrical portion is joined to the outer peripheral portion of the rear group lens chamber 1, and the portion of the cylindrical portion corresponding to the engaging portion 1d has an engaging portion 81 a. The flange portion abuts against an end surface of the rear group lens chamber 1 on the sensor unit 80 side, and has an engagement portion 81b at a portion corresponding to the engagement portion 1 e. These engaging portions ensure the accuracy of the combination of the sensor unit 80 and the rear group unit 0.

In fig. 3, the respective units are shown separately in a sectional view, and as shown in fig. 3, the diaphragm unit 40 is fastened and fixed to the rear group lens chamber 1 by a plurality of screws 47 (3 in the drawing), and the focus unit 60 is fastened and fixed to the rear group lens chamber 1 by a plurality of screws 67 (4 in the drawing), so that not only the front group unit 20 and the sensor unit 80 directly related to the imaging but also the diaphragm unit 40 and the focus unit 60 not directly related to the imaging are directly engaged with the rear group unit 0, and thus the accuracy between the units can be ensured to an extremely high degree. In the case where a unit other than the front group unit 20 is provided as another optical unit, the unit is directly engaged with the rear group unit 0 as a main optical unit, similarly, so that the accuracy thereof is ensured.

Fig. 4 shows a front view of the diaphragm unit 40. As described above, the diaphragm unit 40 has the diaphragm motor 41, the diaphragm motor 41 can drive the diaphragm blades, as shown in fig. 4, a gear train 42 is provided near the diaphragm motor 41, a transmission gear is provided on an output shaft of the diaphragm motor 41, the gear is engaged with one gear of the gear train 42 to transmit the driving force of the diaphragm motor 41 to the gear train 42, and the other gear of the gear train 42 is engaged with the teeth provided on the outer periphery of the diaphragm driving cam 43, so that the gear train 42 can transmit the driving force to the diaphragm driving cam 43 to rotate the diaphragm driving cam 43 about the optical axis center in accordance with the driving of the diaphragm motor 41. When the diaphragm driving cam 43 rotates, the diaphragm blades 44 and the full-close blades 45 are driven to adjust the diaphragm value. The aperture blades 44 include 5, one of which is a fully closing blade 45, and the aperture can be fully closed by the fully closing blade 45. The diaphragm driving cam 43 is provided with a partial protrusion 43a, and pi (photo interceptor) 46 detects a rotation reference position of the diaphragm driving cam 43 and controls the amount of rotation thereof. The PI46 detects the position of the diaphragm driving cam 43 based on the movement of the protrusion 43 a.

In fig. 5 a front view of the focusing unit 60 is shown. As described above, the focus unit 60 includes the focus motor 61, and the lens frame 62 holding the lens L14 has the screw portion 62a, and the lens frame 62 rotates the lens L14 and moves in the optical axis direction. The lens frame 62 is integrally provided with teeth 62 b. The indicator plate 63 indicating the rotational position of the lens frame 62 is relatively movable with respect to the lens frame 62. The PI64 is capable of detecting the position of the identification plate 63. The driving force of the focus motor 61 is transmitted to one gear of the focus gear set 66 through a gear 65 provided on the focus motor 61, and the other gear of the focus gear set 66 is engaged with the teeth 62b of the outer periphery of the lens frame 62.

As described above, since each mechanism of the present application is directly coupled to the rear group unit 0, each mechanism can be assembled with high accuracy, and a high-performance optical system can be obtained by assembling with high accuracy.

The front group unit 20 and the diaphragm unit 40 are both located on the subject side (left side in the drawing) of the rear group unit 0, and by making the distances between the fixed positions of the front group unit 20 and the diaphragm unit 40 with respect to the rear group unit 0 and the optical axis different, the front group unit 20 and the diaphragm unit 40 can be directly combined with the rear group unit 0, thereby ensuring high accuracy. Thereby, the front group unit 20 and the diaphragm unit 40 are fixed in parallel. As shown in fig. 2, a substrate 48 as a holding portion for holding the diaphragm unit 40 is arranged in parallel with the front group lens chamber 21 for holding the front group unit 20.

The focusing unit 60 and the sensor unit 80 are both located on the image side of the rear group unit 0 (right side in the drawing), and similarly, by making the distances between the fixing positions of the focusing unit 60 and the sensor unit 80 with respect to the rear group unit 0 and the optical axis different, both the focusing unit 60 and the sensor unit 80 can be directly coupled to the rear group unit 0, thereby ensuring high accuracy. Thereby, the focusing unit 60 and the sensor unit 80 are fixed in parallel. As shown in fig. 2, the lens frame 62 as a holding portion for holding the focusing unit 60 is arranged in parallel with the sensor holder 81 for holding the sensor unit 80. In the case where a unit other than the front group unit 20 is provided as another optical unit, the other optical unit can be directly coupled to the rear group unit 0 by making the distance between the fixed position and the optical axis different from that of the other unit, and the holder thereof can be aligned with the holder of the other unit.

Further, since the respective mechanisms are independent of each other, and the assembling work and the maintenance work can be performed independently and easily, high assembling performance can be obtained. Further, since the focus motor 61, the diaphragm motor 41, and the position detection PI are collectively provided in the rear group unit 0, an effect of simplifying electric wiring can be obtained.

Further, since the coupling portions of the rear group unit 0 to be coupled to other units, for example, the engaging portions 1a and 1b, the engaging portions 1d and 1e, the screw portion 1c, the screw hole through which the screw 47 is inserted, and the screw hole through which the screw 67 is inserted are integrally provided in a single member of the rear group lens chamber 1 of the rear group unit 0, positional accuracy of the coupling portions can be ensured.

In the present embodiment, the embodiment for the fisheye lens is exemplified, but the units can be directly coupled based on the same technical idea as long as the optical system can be divided into three, four, or five or more units. Even in units coupled in the same direction, direct coupling can be performed in parallel by changing the distance between the coupling sites with respect to the optical axis, and a unit or an optical system having extremely high accuracy as a whole can be obtained.

Claims

1. An optical system is divided into at least three units, each of the at least three units including a main optical unit, another optical unit, and a sensor unit, all of the another optical unit and the sensor unit being directly coupled to the main optical unit, the main optical unit including a lens chamber in which a lens is incorporated, and at least a part of the another optical unit being an optical unit including a lens chamber in which a lens is incorporated.

2. The optical system according to claim 1, wherein the main optical unit is a rear group of the optical system, and the optical units of the other optical units are front groups of the optical system.

3. The optical system according to claim 2, wherein a main mechanism portion of the optical system is directly coupled to the main optical unit in addition to the other optical units.

4. An optical system according to claim 3, characterized in that the main mechanism part is a focus adjustment part having at least one optical lens, which is relatively movable with respect to the main optical unit.

5. The optical system according to claim 3, wherein the main mechanism portion is an aperture adjustment device that is sandwiched between the other optical unit as a front group and the main optical unit as a rear group.

6. The optical system according to claim 4, wherein a mechanism holding portion that holds the focus adjustment portion and a sensor holding portion that holds the sensor portion are provided in parallel.

7. The optical system according to claim 5, comprising a mechanism holding unit for holding the aperture adjusting device and an optical holding unit for holding the other optical unit in parallel.