CN201017090Y

CN201017090Y - Lens device

Info

Publication number: CN201017090Y
Application number: CNU2007200022063U
Authority: CN
Inventors: 吴丽华; 陈昆明
Original assignee: Asia Optical Co Inc
Current assignee: Asia Optical Co Inc
Priority date: 2007-01-10
Filing date: 2007-01-10
Publication date: 2008-02-06
Anticipated expiration: 2017-01-10

Abstract

A lens device can be used for zoom operation in imaging equipment; the lens device comprises a fixing base; a front frame and a lens group are equipped in the fixing base, which can move relative to the fixing base for zoom. The outside of the fixing base is equipped with two focusing cam canisters, which are separately corresponding to the front frame and the lens group. Focusing roller screws fixed on the front frame and the lens group are penetrated through locating grooves equipped on the focusing cam canisters; at the same time the focusing roller screws are fit with focusing roller canisters which are equipped in the locating grooves of the focusing cam canisters. The focusing roller canisters are equipped with focusing roller grooves and an O-shaped ring is equipped in the focus roller canister, which can closely contact both sides of the locating groove to increase lens zoom torque.

Description

Lens assembly

Technical field

The utility model is relevant for a kind of lens assembly, particularly relevant for a kind of have strengthen camera lens torsion (focusing torsion or become times torsion) and can be applicable to have shooting, adjustable focus on the electron optics equipment of video recording and projecting function and become times lens assembly.

Background technology

Along with the continuous progress of imaging technique, particularly various imaging equipment are constantly weeded out the old and bring forth the new, and the lens assembly of imaging equipment also needs constantly to promote precision, being satisfied with the requirement of image quality, and then obtain the optimal images effect.And the zoom function in these equipment normally moves by the mechanical type between each spare part in the lens assembly or rotate the purpose that reaches the change image size of absorbing.Therefore, the processing of each spare part and mobile accuracy directly have influence on the quality of imaging in the lens assembly.

At present when being assembled into the lens assembly of picture equipment, typically using screw or the bolt cylinder of will focus and combine, and see through and move in the positioning groove that the focusing cylinder offered on the focusing cam tube to realize the function of focusing and change times with appurtenances.For the focusing cam tube of manufacturing by the plastic material die sinking, based on the needs that move back mould, on two sidewalls of its positioning groove, must be provided with pattern draft, but also because this pattern draft, the focusing cylinder can't closely contact with the positioning groove sidewall, therefore cause camera lens to kick the beam with becoming times torsion, and then influence the smooth and easy and precision of camera lens quality and spinning movement, finally influence image quality at the focusing torsion of focusing when becoming times.

Summary of the invention

At the problem that aforementioned torsion kicks the beam, the purpose of this utility model is to propose a kind of lens assembly, can closely contact between focusing cylinder wherein and focusing cam tube positioning groove sidewall, thereby promote the start torsion of camera lens.In the utility model, on the focusing cylinder, offer a focusing cylinder gap, its content is provided with O type ring, and described O type ring protrudes into the focusing cylinder and closely contacts with the positioning groove sidewall of focusing cam tube outward.Friction and applying between utilization O type ring and positioning groove sidewall can increase the rotary torsion between focusing cam tube and focusing cylinder.

The utility model can improve the problem that camera lens torsion kicks the beam, and makes camera lens torsion be satisfied with design specification, and improve because of focusing cam tube and focusing cylinder cooperate the not good camera lens that causes separate picture not good with camera lens problem such as repairing once more.And can reduce separate as bad with repeat to assemble the cost of camera lens.

Description of drawings

Fig. 1 is the outside drawing of the utility model lens assembly, and focusing cylinder is wherein represented in the mode that disassembles.

Fig. 2 is the exploded view of focusing cylinder used in the utility model lens assembly.

Fig. 3 is the vertical view of the utility model lens assembly.

Fig. 4 is the sectional view of being got along Fig. 3 center line A-A.

Embodiment

Consult Fig. 1, Fig. 3, Fig. 4, it shows lens assembly of the present invention.In these were graphic, the outside drawing of lens assembly of the present invention was finished in Fig. 1 combination, and Fig. 3 is its vertical view, and Fig. 4 then is the sectional view of getting along Fig. 3 center line A-A.Lens assembly of the present invention includes a holder 61, has a central axis, and has an outer wall around this central axis setting, in this embodiment, this holder 61 slightly is cylindric, have with one heart the cylindrical outer wall around central axis, and the one axial end is provided with an opening.One pre-group frame 21 also slightly is cylindric, and axially aligns in this holder 61 along central axis, and the some of pre-group frame 21 is inserted in the axial end opening of holder 61 haply with one heart, and the two is partly overlapped.61 of pre-group frame 21 and holders can relatively move vertically, to change the distance of the two.Be provided with lens group (not shown) in pre-group frame 21, the distance that therefore changes 61 of pre-group frame 21 and holders can change the position of lens, carries out zoom.If lens group 91 also can be along axially moving with respect to holder 61.

Offer a plurality of pilot holes 211 on the outer wall of pre-group frame 21, it is three in the present embodiment, is 120 degree angle isogonism range distribution on the outer wall of pre-group frame 21, but also more or less pilot hole can be set.With respect to the setting of pilot hole 211, on the outer wall that overlaps with pre-group frame 21 on the holder 61, offer the positioning groove 611 of equal number, correspond respectively to these pilot holes 211.

Each pilot hole 211 in the pre-group frame 21 is equipped with internal thread (not label), can be respectively in conjunction with a focusing cylinder screw 81, this focusing cylinder screw 81 and stretching out passes the corresponding positioning groove 611 on the holder 61, so that pre-group frame 21 and holder 61 are combined, and prevent the two generation relative rotary motion.The positioning groove 611 of this holder 61 is opened on the holder 61 vertically, and can move along for focusing cylinder screw 81, carries out relative displacement vertically for

pre-group frame

21 and 61 of holders.

Other consults Fig. 2, is arranged with a focusing cylinder 83 on focusing cylinder screw 81, can rotate with respect to this cylinder screw 81 of focusing.Focusing cylinder 83 has a smaller diameter portion position 832 at least, is placed in the positioning groove 611 of holder 61.Best, this smaller diameter portion position 832 have focus cylinder 83 all the other partly be little diameter, rough being equivalent to and be slightly smaller than the width of positioning groove 611, is so that be inserted in it.Form a ring-type shoulder (not label) between all the other parts of this smaller diameter portion position 832 and focusing cylinder 83.Therefore focus cylinder 83 except this smaller diameter portion position 832, all be positioned at outside the positioning groove 611, and have the diameter bigger than the width of positioning groove 611, and the ring-type shoulder on the focusing cylinder 83 can be resisted against on the outer wall of these positioning groove 611 2 sides, and then holder 61 is bonded on the pre-group frame 21.

Focusing cylinder 83 has an endoporus (not label), to be sheathed on the focusing cylinder screw 81, do not establish screw thread in this endoporus, and its internal diameter than the slightly larger in diameter of the threaded portion of focusing cylinder screw 81 some, freely rotate and unrestricted with respect to the cylinder screw 81 of focusing so can make focusing cylinder 83.

Sheathed with one heart one columned focusing cam tube 31 on the outer wall of holder 61, it can rotate around the outer wall of holder 61.On focusing cam tube 31, be provided with multiple tracks positioning groove 311, correspond respectively to these focusing cylinder screws 81.These positioning grooves 311 penetrate the wall portion of focusing cam tube 31, and are evenly distributed on obliquely in the wall portion of focusing cam tube 31.Positioning groove 311 is obliquely installed along the cylindrical outer wall of focusing cam tube 31, thus its bearing of trend not with the axially parallel of focusing cam tube 31, also non-perpendicular to axial ring Zhou Fangxiang, but be spiral fashion partly.The rough external diameter that is equivalent to and is a bit larger tham the cylinder 83 of focusing of the width of positioning groove 311 can be placed in it for focusing cylinder 83, and the cylinder 83 of therefore focusing is placed in the positioning groove 611 of the positioning groove 311 of focusing cam tube 31 and holder 61 simultaneously.

Focusing cylinder 83 can contact with the side of positioning groove 311, and makes the contact condition that forms a kind of camming action between positioning groove 311 and the focusing cylinder 83.By the contact condition of this camming action, rotate focusing cylinder 83 and can force focusing cylinder 83 in the positioning groove 611 of holder 61, to move vertically, and then drive pre-group frame 21 axially moves with respect to holder 61.

On the outer surface of focusing cylinder 83, offer the focusing cylinder gap 831 of a ring Zhou Yanshen, sheathed and fix an O type ring 82 in it.Therefore the external diameter of this O type ring 82 is greater than the external diameter of focusing cylinder 83, and when being inserted in focusing cylinder gap 831, this O type ring 82 protrudes in outside the cylinder 83 of focusing partially, and can do more closely with the positioning groove 611 of holder 61 and contact.Thus, this O type ring 82 is made of deformable material, in order to promote the effect that it contacts with the sidewall of positioning groove 611.By the rubbing action that this kind contacts more closely and O type ring 82 is produced, can promote start torsion and the stability of this lens assembly when zoom effectively on the sidewall of positioning groove 611.

In addition, with respect to pre-group frame 21, the lens group 91 of in the opposite side end openings of holder 61, planting with one heart, and the two is overlapped at least partially.This lens group 91 also can axially move with respect to holder 61 along the central axis of holder 61 as pre-group frame 21.With respect to the overlapping of 61 of lens group 91 and holders partly, outside holder 61, be provided with another focusing cam tube 51.This focusing cam tube 51 is similar with focusing cam tube 31 in structure and start, in other words, on focusing cam tube 51, also be provided with multiple tracks positioning groove 511, shape extends along the cylindrical wall portion of focusing cam tube 51 in the shape of a spiral, on lens group 91, be provided with simultaneously corresponding positioning hole (not label), can be respectively in conjunction with the focusing cylinder screw 81 that penetrates the positioning groove 511 of focusing cam tube 51, and see through focusing cylinder screw 81 and go up engaging and friction of set O type ring 82 and positioning groove 511 sidewalls, can realize lens group 91 with respect to the moving axially of holder 61, and then the distance of adjusting is between the two carried out zoom.

Sum up above-mentioned explanation, can recognize, the utility model passes the positioning groove 311 and the positioning groove 511 of focusing cam tube 31, focusing cam tube 51 by the focusing cylinder screw 81 that is arranged with focusing cylinder 83, and the positioning groove 611 of holder 61, and be fixed in the pilot hole of the pilot hole 211 of pre-group frame 21 and lens group 91.O type ring 82 on the focusing cylinder screw 81 on the sheathed focusing cylinder 83 can closely contact with focusing cam tube 31 and focusing cam tube 51, forms the structure that a kind of each part could freely rotate and have enough friction force.

Claims

1. lens assembly includes: a holder, and described holder has a central axis, and has an outer wall around described central axis setting, described outer wall is provided with the positioning groove that runs through at least together, and described holder has one first end, which is provided with first opening; One pre-group frame, it is inserted in first opening of described holder with one heart and partially, and can axially move with respect to described holder, to change the distance between described pre-group frame and described holder, the outer wall of described pre-group frame is provided with at least one pilot hole, correspond respectively to each positioning groove of holder, be provided with internal thread in the described pilot hole; One focusing cam tube, it is sheathed on the described holder with one heart, and can rotate with respect to the outer wall of described holder, offer at least one positioning groove on the described focusing cam tube, correspond respectively to each pilot hole of described pre-group frame, and the positioning groove of described focusing cam tube is not parallel to the positioning groove of described holder; One focusing cylinder screw, extend through the positioning groove of described focusing cam tube and the positioning groove of described holder, and be incorporated on the internal thread of described pre-group frame pilot hole, a sheathed rotationally focusing cylinder on described focusing cylinder screw, described focusing cylinder is placed in the positioning groove of focusing cam tube movably; It is characterized in that:

Described lens assembly also comprises an O type ring, and described O type ring set is located on the described focusing cylinder and can be closely contacted with the positioning groove of focusing cam tube.

2. the lens assembly according to claim 1, it is characterized in that: described focusing cylinder is provided with a focusing cylinder gap, in order to partly ccontaining and secure the above O type ring, and O type ring portion part is protruded in outside the focusing cylinder, contact with the positioning groove of focusing cam tube.

3. the lens assembly according to claim 1, it is characterized in that: described focusing cylinder is provided with a smaller diameter portion position, form a ring-type shoulder, described smaller diameter portion position is placed in the positioning groove of described holder, and makes its ring-type shoulder be positioned at the two sidewalls top of the positioning groove of described holder.

4. lens assembly according to claim 1 is characterized in that: the positioning groove of described holder in axial direction is arranged on the outer wall of holder.

5. lens assembly according to claim 1 is characterized in that: the positioning groove of described focusing cam tube is partly spiral fashion setting.

6. lens assembly according to claim 1 is characterized in that: described pre-group frame is provided with three pilot holes, and relative, be provided with three road positioning grooves on the outer wall of holder, and the focusing cam tube is provided with three road positioning grooves.

7. lens assembly according to claim 1, it is characterized in that: described holder has one second end, it is vertically with respect to described first terminal the setting, described second end offers one second opening, the lens group of can planting with one heart and partially in it, described lens group can axially move with respect to described holder, to change the distance between described lens group and described holder, described lens group is provided with at least one pilot hole, correspond respectively to each positioning groove of holder, be provided with internal thread in the described pilot hole, sheathed with one heart another focusing cam tube on the outer wall of holder, can rotate with respect to holder, and offer at least one positioning groove on it, each pilot hole of the corresponding described lens group of difference, and the positioning groove of described another focusing cam tube is not parallel to the positioning groove of described holder, one focusing cylinder screw extends through the positioning groove of described another focusing cam tube and the positioning groove of described holder, and be incorporated on the internal thread of pilot hole of described lens group, a sheathed rotationally focusing cylinder on described focusing cylinder screw, described focusing cylinder is placed in the positioning groove of described another focusing cam tube movably, on described focusing cylinder, be arranged with an O type ring, closely contact in order to positioning groove with described another focusing cam tube.

8. lens assembly according to claim 7, it is characterized in that: the focusing cylinder of described lens group is provided with a focusing cylinder gap, for partly ccontaining and secure the above O type ring, and O type ring portion part is protruded in outside the focusing cylinder, contact in order to positioning groove with described another focusing cam tube.

9. lens assembly according to claim 7, it is characterized in that: the focusing cylinder of described lens group is provided with a smaller diameter portion position, form a ring-type shoulder, described smaller diameter portion position is placed in the positioning groove of described holder, and makes its ring-type shoulder be positioned at the two sidewalls top of the positioning groove of described holder.

10. lens assembly according to claim 7 is characterized in that: the positioning groove of described holder in axial direction is arranged on the outer wall of holder, and the positioning groove of described another focusing cam tube is partly spiral fashion setting.

11. lens assembly according to claim 7 is characterized in that: described lens group is provided with three pilot holes, and relative, be provided with three road positioning grooves on the outer wall of described holder, and described another focusing cam tube is provided with three road positioning grooves.