CN208076805U

CN208076805U - Photographic device

Info

Publication number: CN208076805U
Application number: CN201820669647.7U
Authority: CN
Inventors: 霍昊扬
Original assignee: Shenzhen Bo Son Photoelectric Technology Co Ltd
Current assignee: Shenzhen Bo Son Photoelectric Technology Co Ltd
Priority date: 2018-05-07
Filing date: 2018-05-07
Publication date: 2018-11-09
Anticipated expiration: 2028-05-07

Abstract

The utility model provides a kind of photographic device.The photographic device is not necessarily to that the offset of the focal position of lens when collet chuck can inhibit temperature change is arranged, and cost is relatively low.The photographic device has：Lens unit, the frame with multiple lens and the multiple lens of storage；Holder keeps the lens unit；And photographing element, it is received through the light beam after the lens, the holder includes threaded portion, it can utilize the threaded portion that the lens unit is made to be moved along optical axis direction, the engaging section central point of the threaded portion is set to side of the middle part by subject of the optical full length than the photographic device, the material of the holder is the coefficient of thermal expansion material smaller than the coefficient of thermal expansion of the material of the frame, the holder and the frame, the lens back focal length between meet following relationship, LhCTEh=LbCTEb-bfCTEf.

Description

Photographic device

Technical field

The utility model is related to a kind of photographic devices equipped with the lens unit with multiple lens, even if providing one kind The variation of the external environments such as external pressure, temperature also can steadily maintain the photographic device of the focal position of lens.

Background technology

As the photographic device for being used in onboard camera, monitoring camera etc., most use equipped with it is small-sized and it is low at The photographic device of the lens unit of this fixed-focus referred to as pan focus type.

For example, in photographic device recorded in patent document 1, it is configured to, in the outer spiral shell that the periphery of lens unit is formed Line and holder inner circumferential formed internal thread be threadedly engaged, make lens by so that lens unit is rotated relative to holder Unit is moved along optical axis direction, to be adjusted to the focal position relative to imaging surface of lens.By holder with Collet chuck is set between frame and the coefficient of thermal expansion of respective material is made to be constant relationship, to inhibit lens when temperature change Focal position offset.

Existing technical literature

Patent document 1：9594228 patent specifications of US

Utility model content

Utility model will solve the problems, such as

In photographic device recorded in patent document 1, lens unit is only positioned by screw thread relative to holder, because This, in order on inhibiting optical axis direction of the loosening between external screw thread and internal thread without generating lens unit position offset, Focal position is steadily maintained in the case of inclination of optical axis etc., needs high-precision screw thread, there is the load for incurring cost increase Sorrow.

In photographic device recorded in patent document 1, collet chuck (cartridge clamp) is needed between holder and frame, because There are the worries that part increases and incur cost increase for this.

The utility model is made in view of such situation, it is intended that providing a kind of it is not necessary that collet chuck is arranged just The photographic device of the low cost of the offset of the focal position of lens when can inhibit temperature change.

The solution to the problem

In order to solve the above problems, the utility model provides a kind of photographic device, has：Lens unit has more A lens and the frame for storing multiple lens；Holder keeps lens unit；And photographing element, it receives by saturating Light beam after mirror, holder include threaded portion, can utilize the threaded portion that lens unit is made to be moved along optical axis direction, threaded portion Engaging section central point is set to side of the middle part by subject of the optical full length than photographic device, and the material of holder is that heat is swollen The swollen rate material smaller than the coefficient of thermal expansion of the material of frame, holder and frame, lens back focal length between meet following relationship, LhCTEh=LbCTEb-bfCTEf.Wherein, Lh：The length of holder, Lb：The length of frame, bf：Back focal length, CTEh：The coefficient of thermal expansion of the material of holder, CTEb：The coefficient of thermal expansion of the material of frame, CTFf：The rate of temperature change of lens.

Can also be that lens unit has fixed component, the fixed component will be away from taking the photograph towards the direction of the photographing element The nearest lens of image planes are fixed relative to the position of the frame.

It can also be that the fixed component will be bonded together away from the nearest lens of imaging surface and the frame, alternatively, will be away from The nearest lens of imaging surface and pressure ring are bonded together.

Can also be that the fixed component is directed towards bullet of the direction pressing away from the nearest lens of imaging surface of the imaging surface Property component.

The effect of utility model

Using the photographic device of the utility model, it is not necessary that the focus of lens when collet chuck can inhibit temperature change is arranged The offset of position, cost are relatively low.

Description of the drawings

Fig. 1 is the sectional view of the structure of the photographic device for the embodiment 1 for indicating the utility model.

Fig. 2 is the stereogram of the structure of the photographic device for the embodiment 1 for indicating the utility model.

Fig. 3 is the front view of the elastic component of the embodiment 1 of the utility model.

Fig. 4 is the side view of the elastic component of the embodiment 1 of the utility model.

Fig. 5 is the definition graph of the bonding structure of the embodiment 1 of the utility model.

Fig. 6 is the sectional view of the structure of the photographic device for the embodiment 2 for indicating the utility model.

Fig. 7 is the sectional view of the structure of the photographic device for the embodiment 3 for indicating the utility model.

Fig. 8 is the sectional view of the structure of the photographic device for the embodiment 4 for indicating the utility model.

Reference sign

10, holder；11, circuit board mounting portion；12, threaded portion；13a, front side fitting portion；13b, rear side fitting portion； 13c, engaging section central point；14, adhesive portion；14a, front end face；14b, rear end face；15, front end；LU, lens unit；20, mirror Frame；21, lens incorporating section；21a, L1, fitting portion；22, aperture section；23,23a, 23b, front side threaded portion；24, rear side threaded portion； 25a, front side fitting portion；25b, rear side fitting portion；26, adhesive portion；27, abutting part；30, front side pressure ring；31, lens maintaining part； 32, threaded portion；40, the 1st spacer ring；50, the 2nd spacer ring；60, rear side pressure ring；61, lens press section；62, threaded portion；63, embedding Conjunction portion；64, lens adhesive portion (fixed component)；70, force application spring (fixed component)；80, containment member；90, containment member； 100, shell；The lens of L1~L8, the 1st lens~the 8th；L1a, side reducing diameter part；L8a, lens adhesive portion (fixed component)；A, light Axis；F, optical filter；S, solid-state imager；S1, protective glass；S2, imaging surface；S3, circuit board interconnecting piece；Lh, guarantor The length (the distance between engaging section central point and imaging surface) of gripping member；Lb, frame length (engaging section central point with the 8th thoroughly The distance between mirror)；Bf, back focal length (the distance between the 8th lens and imaging surface)；TL, optical full length.

Specific implementation mode

Hereinafter, specifically describing the photographic device for implementing the utility model based on attached drawing.

Fig. 1 is the definition graph of the structure of the photographic device for the embodiment 1 for indicating the utility model.As illustrated, it takes the photograph As device has：Lens unit LU；Holder 10 keeps lens unit LU；And the solid-state imagers S such as CMOS, CCD, It is received through the light beam after lens.

Lens unit LU includes：Lens L1~lens L8；Optical filter F；Frame 20 has and stores and keep lens Lens incorporating section 21；Lens L1~lens L3 is pressed and is fixed on frame 20 by front side pressure ring 30；Rear side pressure ring 60, Lens L4~lens L8 is pressed and be fixed on frame 20, and optical filter F is kept with chimeric for optical filter F Fitting portion 63；And force application spring 70, there is elasticity, to image side to lens L4~lens L8 forces.

The threaded portion 32 of front side pressure ring 30 and the front side threaded portion 23a of frame 20 are threadedly engaged, the screw thread of rear side pressure ring 60 Portion 62 and the rear side threaded portion 24 of frame 20 are threadedly engaged.Rear side pressure ring 60 is equipped with the lens press section 61 by applanation lens 8.

As shown in Figure 3, Figure 4, force application spring 70 is the leaf spring of wave washer shape, in the abutting part 27 and lens of frame 20 It is compressed along plate thickness direction between the abutting part L51 of L5, the force application spring 70 is to image side to lens L4~lens L8 forces.

In addition, as shown in Figure 1, be equipped with the 1st spacer ring 40 between lens L6 and lens L7, lens L7 and lens L8 it Between be equipped with the 2nd spacer ring 50.

For holder 10, by making threaded portion 12 and the front side threaded portion 23b of frame 20 be threadedly engaged, thus by lens Unit LU, which is remained, to be moved along optical axis direction, also, the circuit board mounting portion 11 of holder 10 be threadably secured or The fixing means such as bonding are fixed together with the circuit board (not shown) for being equipped with solid-state imager S.

Solid-state imager S has protective glass S1 and imaging surface S2, the circuit board interconnecting piece S3 of solid-state imager S It is electrically connected with circuit board (not shown).

Holder 10 also have by can make lens unit LU along optical axis direction move in a manner of it is chimeric for lens unit LU And keep the i.e. front side fitting portion 13a and rear side fitting portion 13b, front side fitting portion 13a of two fitting portions of lens unit LU chimeric It is embedded in the rear side fitting portion 25b of frame 20 in the front side fitting portion 25a of frame 20, rear side fitting portion 13b.Thereby, it is possible to The mode for keeping the optical axis A of lens unit LU vertical relative to imaging surface S2 stably keeps lens unit LU.

In addition, threaded portion 12 is set to than the middle part between front side fitting portion 13a and rear side fitting portion 13b by subject Side, front side threaded portion 23b, which is set to, leans on the one of subject than the middle part between front side fitting portion 25a and rear side fitting portion 25b Side, also, the distance between front side fitting portion 13a and rear side fitting portion 13b the two fitting portions and front side fitting portion 25a with The distance between the two fitting portions of rear side fitting portion 25b are 1/2 or more of lens unit overall length, that is, threaded portion 12 and front side The engaging section central point 13c of threaded portion 23b is set to side of the middle part by subject of the optical full length TL than photographic device, because This, even if can prevent the focal position of lens from deviating if in the case where being applied to lens unit from external side pressure etc. The inclination of such optical axis.Here, as shown in Figure 1, the optical full length TL of photographic device is i.e. saturating from lens optical system top Distance until vertex end to imaging surface S2.

In addition, on holder 10, equipped with the side for running through holder 10 in a manner of making frame 20 be exposed to outside Adhesive portion 14 can be in the front end face 14a of adhesive portion 14 and gluing for 20 side of frame by applying bonding agent B in adhesive portion 14 It is lens unit LU is Nian Jie solid between socket part 26 and between the rear end face 14b of adhesive portion 14 and the adhesive portion 26 of 20 side of frame Due to holder 10.In addition, as shown in Fig. 2, adhesive portion 14 is provided with every 120 ° of ground at 3 in the circumferential direction of holder 10.Separately Outside, either being directly bonded lens unit LU using adhesive portion 14, can also be using adhesive portion 14 be bonded other components and Lens unit LU is fixed via other components.

The advantages of illustrating the adhering method.In the past, in the photographic device of fixed-focus, existing causes because of temperature change Lens focal position offset the problem of, and because the expansion of bonding agent, shrink due to cause lens unit movement be exactly its reason it One.

For example, in the previous photographic device being fixed using bonding agent, lens unit and holder pass through screw thread And it is threadedly engaged, it is possible to produce thread looseness, the sometimes expansion of the bonding agent caused by temperature change shrink due to make lens list Member moves amount corresponding with thread looseness along optical axis direction, is deviated so as to cause focal position.

Adhering method according to the present utility model, even if temperature change leads to bonding agent B expansions, shrinks, due to being protected The limitation of the front end face 14a and rear end face 14b of the adhesive portion 14 of gripping member 10, lens unit LU will not be moved along optical axis direction, Focal position can steadily be maintained.

In addition, in patent document 1, it is proposed that following methods：Setting lens carrier (holder) and lens as follows Machine barrel (frame), collet chuck, lens focal length between relationship, that is,

LcCTEc=LmCTEm+LbCTEb-LfCTEf

Wherein, Lc：The length of collet chuck, Lm：The length of lens carrier, Lb：The length of lens machine barrel, Lf：The focus of lens Distance, CTEc：The coefficient of thermal expansion of collet chuck material, CTEm：The coefficient of thermal expansion of lens carrier material, CTEb：Lens machine barrel material Coefficient of thermal expansion, CTEf：The rate of temperature change of lens,

As a result, focal position is also able to maintain that in temperature change.That is, being the negative direction in temperature change using collet chuck The flexible method to offset the movement of the holder and frame that stretch in same direction using imaging surface as starting point.

In contrast, according to the utility model, holder 10 and frame 20 in the middle part than lens unit LU by shot The side of body is fixed to each other by threaded portion 12 and front side threaded portion 23b and adhesive portion 14,26, therefore, in temperature change When, holder 10 and frame 20 stretch in reverse direction using imaging surface S2 as starting point.Therefore, in the present invention, as follows The relationship between the back focal length of holder 10 and frame 20, lens is set,

LhCTEh=LbCTEb-bfCTEf

Wherein, Lh：The length of holder, Lb：The length of frame, bf：Back focal length, CTEh：The thermal expansion of holder material Rate, CTEb：The coefficient of thermal expansion of frame material, CTFf：The rate of temperature change of lens,

CTFf is determined by the whole characteristic of the optical system comprising optical full length TL.

Focal position is also able to maintain that in temperature change as a result, therefore does not need collet chuck, so as to inhibit cost.

Here, as shown in Fig. 1, Fig. 6, the length Lh of holder is the front side of the threaded portion 12 and frame 20 of self-insurance gripping member 10 Engaging section central point 13c between the 23b of threaded portion play imaging surface S2 until distance, the length Lb of frame is self-insurance gripping member 10 Threaded portion 12 and the front side threaded portion 23b of frame 20 between engaging section central point 13c play the rear surface of the 8th lens L8 and be Distance only.In addition, back focal length bf is the distance until playing imaging surface S2 from the rear surface of the 8th lens L8.

In addition, Fig. 6 is the definition graph of the structure of the photographic device for the embodiment 2 for indicating the utility model, it is in front side Threaded portion 12 is equipped between fitting portion 13a and rear side fitting portion 13b and between front side fitting portion 25a and rear side fitting portion 25b The variation of photographic device equipped with threaded portion 23, the utility model embodiment 1.

In addition, Fig. 7 is the definition graph of the structure of the photographic device for the embodiment 3 for indicating the utility model, it is not have The variation of front side fitting portion 13a and the photographic device of front side fitting portion 25a, the utility model embodiment 1.

It is identical as embodiment 1 in embodiment 2, the engaging section central point of threaded portion 12 and front side threaded portion 23b 13c is set to side of the middle part by subject of the optical full length TL than photographic device, therefore, although compared with embodiment 1 The precision of optical axis is slightly worse, but identical as embodiment 1, even if the case where being applied to lens unit from external side pressure etc. Under, it can also prevent the focal position of lens from deviating the inclination of such optical axis.

In addition, in the present invention, due to having with elasticity and being applied to image side to lens L4~lens L8 forces Power spring 70, therefore, in temperature change, even if being produced because of the difference of the coefficient of thermal expansion between frame 20 and lens L4~lens L8 Raw gap, can also prevent from loosening between lens because of the gap, while can ensure that the 8th lens L8 is in away from sensor Closer position, so as to steadily maintain back focal length bf.

In addition, elastic component be set between the 6th lens L6 and the 7th lens L7 or the 7th lens L7 and the 8th lens L8 it Between, it equally can also prevent the gap of the difference generation of reason coefficient of thermal expansion and be loosened between lens, can steadily be tieed up Hold back focal length bf.

In addition, as shown in figure 5, rear side pressure ring 60 and the 8th lens L8 have been adhesively fixed using lens adhesive portion L8a, 64 Come, although thus can not prevent from loosening because thermally expanding the lens occurred, can ensure that the 8th lens L8 is in away from sensor always Thus closer position also can steadily maintain back focal length bf.Alternatively, it is also possible to being between frame 20 and the 8th lens L8 This is carried out to be adhesively fixed.

Next, illustrating another advantage of the adhering method using Fig. 8.Fig. 8 is the embodiment party for indicating the utility model The definition graph of the structure of the photographic device of formula 4 is the variation of the photographic device of the embodiment 1 of above-mentioned the utility model, is One example of the photographic device with water proof structure.Common for the photographic device of the embodiment 1 with the utility model Part, the description thereof will be omitted.

Lens unit LU is included between the side reducing diameter part L1a of the 1st lens L1 and the L1 fitting portions 21a of frame 20 by edge Radial (along the direction at a right angle with optical axis) compression, flexible containment member 80, so that it is guaranteed that the lens of frame 20 are received The water proofing property received in portion 21.

Photographic device further include between the front end of holder 10 15 and shell 100 only along optical axis direction it is compressed, Flexible containment member 90, so that it is guaranteed that the water proofing property of photographic device peripheral portion.

Here, the lens unit for being located at holder front end in previous example is adhesively fixed, the position in portion is in the utility model In be located at the side of self-insurance gripping member 10 towards through-hole, that is, adhesive portion 14 of lens unit LU, therefore, containment member 90 will not with it is viscous It connects agent B phases to interfere, it can be ensured that water proofing property.

In addition, according to the water proof structure, even if causing to occur between lens unit LU and shell 100 because of part error In the case of dislocation, side pressure will not be made to be applied to lens unit LU, therefore energy under the action of the elastic force of containment member 90 Enough focal positions for steadily maintaining lens.

Claims

1. a kind of photographic device, has：Lens unit, the frame with multiple lens and the multiple lens of storage；It keeps Part keeps the lens unit；And photographing element, it receives through the light beam after the lens,

The holder includes threaded portion, can utilize the threaded portion that the lens unit is made to be moved along optical axis direction,

The middle part that the engaging section central point of the threaded portion is set to the optical full length than the photographic device leans on the one of subject Side,

The material of the holder is the coefficient of thermal expansion material smaller than the coefficient of thermal expansion of the material of the frame,

The holder and the frame, the lens back focal length between meet following relationship,

LhCTEh=LbCTEb-bfCTEf

Wherein, Lh：The length of holder, Lb：The length of frame, bf：Back focal length, CTEh：The coefficient of thermal expansion of the material of holder, CTEb：The coefficient of thermal expansion of the material of frame, CTFf：The rate of temperature change of lens.

2. photographic device according to claim 1, which is characterized in that

The lens unit has a fixed component, which will be nearest away from imaging surface towards the direction of the photographing element Lens are fixed relative to the position of the frame.

3. photographic device according to claim 2, which is characterized in that

The fixed component will be bonded together away from the nearest lens of imaging surface and the frame, alternatively, will be nearest away from imaging surface Lens and pressure ring are bonded together.

4. photographic device according to claim 2, which is characterized in that

The fixed component is directed towards elastic component of the direction pressing away from the nearest lens of imaging surface of the imaging surface.