CN103163618A

CN103163618A - Lens group

Info

Publication number: CN103163618A
Application number: CN2011104063735A
Authority: CN
Inventors: 陈昆明
Original assignee: Asia Optical Co Inc
Current assignee: Asia Optical Co Inc
Priority date: 2011-12-08
Filing date: 2011-12-08
Publication date: 2013-06-19

Abstract

The invention relates to a lens group which comprises a fixed cylinder, a cam cylinder, a lens frame and a limiting part. A direct inlet groove and a limiting hole are arranged on the wall of the fixed cylinder, the direct inlet groove and the limiting hole extend along the direction which is parallel to an optical axis of the lens group, the cam cylinder is sleeved on the fixed cylinder and can rotate corresponding to the fixed cylinder, a cam groove is formed in the wall of the cam cylinder, and when the cam cylinder and the fixed cylinder rotate in a preset angle mode, the cam cylinder and the fixed cylinder are communicated with the direct inlet groove, and a limiting groove is communicated with the limiting hole. The lens frame is arranged in the fixed cylinder and provided with a protrusion shaft which is arranged in the direct inlet groove and the cam groove, and when the am cylinder rotates, the protrusion shaft moves along the cam groove and the direct inlet groove. The limiting part penetrates through the limiting groove and is combined with the limiting hole, and when the cam cylinder rotates for a certain angle, the limiting part is connected with one of walls of two ends of the limiting grooves in an abutting mode so as to enable the cam cylinder to be limited by the angle.

Description

Lens group

Technical field

The present invention is relevant with optical devices, in more detail refers to a kind of lens group.

Background technology

In recent years, as day by day universal in optical devices such as projector, video camera, microscopes along with the progress of optics science and technology, and the lens group that above-mentioned optical devices use also becomes the emphasis that the main force of many manufacturers produces.

And many manufacturers are on making, and usually can design camera lens with the optical devices of same type under identical optical design, have separately different maximum multiplying powers, use model or the grade of difference optical devices.

And be to make each camera lens can have respectively different maximum multiplying powers, the manufacturer usually different maximum multiplying power die sinking of corresponding each camera lens institute's palpus make the cam canister that several have the different length cam path, use making camera lens under identical optical design, can have separately different maximum multiplying powers.

Yet, the mode that several cam canisters with different length cam path are made in above-mentioned die sinking not only need expend more cost, and when the camera lens of a certain maximum multiplying power need be eliminated or change, must will should abandon by whole cam canisters corresponding to maximum multiplying power, and then will cause the waste of cost.Therefore, known lens group design is not discriminated perfect yet, and the part that haves much room for improvement.

Summary of the invention

The technical problem to be solved in the present invention is, for separately the fixing defective of maximum multiplying power under identical optical design of camera lens in prior art, provides a kind of lens group, can change on demand the maximum multiplying power of this lens group.

The present invention is that the technical scheme that its technical matters of solution adopts is, a kind of lens group is provided, and includes stationary magazine creel, cam canister, at least one lens hanger and limited part; What wherein, have on the barrel of this stationary magazine creel that at least one optical axis direction along parallel this lens group extends directly advances groove and at least one spacing hole; This cam canister is sheathed on this stationary magazine creel, and can rotate relative to this stationary magazine creel; Have at least one cam path on the barrel of this cam canister when this cam canister and this stationary magazine creel are rotation in a predetermined angular, can advance directly with this that groove is communicated with and stopper slot is communicated with this spacing hole; This lens hanger is located in this stationary magazine creel, and this lens hanger has at least one protruding axle and be arranged in simultaneously this and directly advance groove and this cam path, and when this cam canister rotated, this protruding axle directly advanced groove along this cam path and this simultaneously and moves; This limited part passes this stopper slot and is combined with this spacing hole, and when this cam canister turns to an angle, this limited part will with the one butt of this stopper slot two ends cell wall, and make this cam canister be subject to this angle person.

By this, see through this limited part and limit the angle that this cam canister rotates, use and limit the maximum multiplying power of this camera lens, and then reach the purpose that changes the maximum multiplying power of this lens group.

Description of drawings

Fig. 1 is the exploded view of lens group of the present invention.

Fig. 2 to Fig. 4 is the stereographic map of lens group of the present invention.

Fig. 5 discloses and utilizes limited part to adjust the maximum multiplying power of lens group.

Embodiment

For being illustrated more clearly in the present invention, hereby lifting preferred embodiment and coordinate accompanying drawing to be described in detail as follows.

See also Fig. 1 and Fig. 2, the lens group of preferred embodiment of the present invention includes stationary magazine creel 10, cam canister 20, four lens hangers 31～34 and limited part 40.Wherein:

Have three on the barrel of this stationary magazine creel 10 and directly advance groove 12 and spacing hole 14, these directly advance groove 12 and are equally spaced on the barrel of this stationary magazine creel 10, and respectively this directly advances groove 12 and has certain-length and extend along the direction that is parallel to this lens group optical axis.This spacing hole 14 is screws.

This cam canister 20 is being sheathed on relative to the mode that this stationary magazine creel 10 rotates on this stationary magazine creel 10.Have three the first cam paths 21, three the second cam paths 22, three article of the 3rd cam path 23 and three articles of four-cam grooves 24 on the barrel of this cam canister 20, and when this cam canister 20 and this stationary magazine creel 10 are rotation in a predetermined angular, respectively this first cam path 21, respectively this second cam path 22, respectively the 3rd cam path 23 and respectively this four-cam groove 24 can with this stationary magazine creel 10 on corresponding directly advance groove 12 connections.In addition, have more stopper slot 25 on the barrel of this cam canister 20, be positioned at the limit end of this cam canister 20, and be communicated with this spacing hole 14 of this stationary magazine creel 10.

This four lens hanger 31～34 is respectively first mirror horse 31, the second lens hanger 31, the 3rd lens hanger 33 and the 4th lens hanger 34, and is respectively arranged with lens set 51～54 in these lens hangers 31～34.These lens hangers 31～34 sequentially are located in this stationary magazine creel 10, and respectively the outer peripheral edges of this lens hanger 31～34 are respectively equipped with three protruding axle 31a～34a.Wherein, respectively this protruding axle 31a of this first mirror horse 31 passes this corresponding first cam path 21 and is arranged in respectively that this directly advances groove 12; Respectively this protruding axle 32a of this second lens hanger 32 passes this corresponding second cam path 22 and is arranged in respectively that this directly advances groove 12; Respectively this protruding axle 33a of the 3rd lens hanger 33 passes the 3rd corresponding cam path 23 and is arranged in respectively that this directly advances groove 12; Respectively this protruding axle 34a of the 4th lens hanger 34 passes this corresponding four-cam groove 24 and is arranged in respectively that this directly advances groove 12.

By this, see also Fig. 3 and Fig. 4, when this cam canister 20 and this stationary magazine creel are rotation in this predetermined angular, the protruding axle 31a～34a of these lens hangers 31～34 will move along the cam path 21～24 of correspondence and directly advance groove 12 with these and move, use the position that changes these lens set 51～54, and then reach the purpose that changes multiplying power.

in addition, in the present embodiment, this limited part 40 is to screw rod that should spacing hole 14, when user's wish is adjusted the maximum multiplying power of this lens group, just this limited part 40 is passed this stopper slot 25 and spiral shell is located in this spacing hole 14, by this, see also Fig. 5, when this cam canister 20 turns to an angle, this limited part 40 will with the one butt of these stopper slot 25 two ends cell walls, and make this cam canister 20 be subject to this angle, and this angle is less than the rotating predetermined angular of this cam canister 20, this will make the protruding axle 31a～34a of these lens hangers 31～34 terminate between corresponding cam path 12 two ends, and then reach the purpose of the maximum multiplying power that downgrades this lens group.For example, the stroke that we can first design these cam paths 12 of this lens group can make the high magnification of this lens group reach 1.8, then, see through again the Position Design of this spacing hole 14, the cell wall that makes this limited part 40 connect to this stopper slot 25 limits the angle that this cam canister 20 rotates, and makes the maximum multiplying power of this lens group be cut to other multiplying power in the stroke of these cam paths 12 (as the multiplying powers such as 1.7,1.6 or 1.5).

It is worth mentioning that, limited part of the present invention and spacing hole also can limit with latch and perforation or other feasible mode the angle of this cam canister rotation except the combination of using screw rod and screw.In addition, also can to set up on demand be that two, three or three are with the corresponding different multiplying power of coming up to the spacing hole on stationary magazine creel of the present invention.The above only is the better possible embodiments of the present invention, such as uses equivalent structure and method variation that instructions of the present invention and claim are done, ought to be included in the scope of the claims of the present invention.

Claims

1. a lens group, is characterized in that, comprises:

Stationary magazine creel, what have on its barrel that at least one optical axis direction along parallel this lens group extends directly advances groove and at least one spacing hole;

Cam canister is sheathed on this stationary magazine creel, and can rotate relative to this stationary magazine creel; Have at least one cam path on the barrel of this cam canister when this cam canister and this stationary magazine creel are rotation in a predetermined angular, can advance directly with this that groove is communicated with and stopper slot is communicated with this spacing hole;

At least one lens hanger is located in this stationary magazine creel, and this lens hanger has at least one protruding axle and be arranged in simultaneously this and directly advance groove and this cam path, and when this cam canister rotated, this protruding axle directly advanced groove along this cam path and this simultaneously and moves; And

Limited part passes this stopper slot and is combined with this spacing hole, and when this cam canister turns to an angle, this limited part will with the one butt of this stopper slot two ends cell wall, and make this cam canister be subject to this angle person.

2. lens group as claimed in claim 1, is characterized in that, this spacing hole is screw, and this limited part is the screw rod that coordinates with this screw.

3. lens group as claimed in claim 1, is characterized in that, this stopper slot is positioned at the limit end of this cam canister.

4. lens group as claimed in claim 1, is characterized in that, this limited part will be with the one butt of this stopper slot two ends cell wall and when making this cam canister be subject to this angle, and this protruding axle is between this cam path two ends.

5. lens group as claimed in claim 1, is characterized in that, this limited part will be with the one butt of this stopper slot two ends cell wall and made the limited angle that stops of this cam canister less than this predetermined angular.