JPS6088914A - Lens position adjusting and fixing device of optical equipment - Google Patents

Abstract

PURPOSE:To rotate a lens cell with relatively small force and eliminate the play between a clamping member and the lens cell substantially even during the rotation of the lens cell by interposing a flexible intermediate member between the lens cell and clamping member, and providing the lens cell with a spiral groove which engages the intermediate member. CONSTITUTION:The flexible intermediate member 20 is layered between the curved part of the clamping member 11 and lens cell 2. The spiral groove 21 consisting of, for example, a male screw is formed in the outer circumferential surface of the lens cell 2, and the intermediate member 20 interlocks with the spiral groove 21, so that both engage each other. The intermediate member 20 uses preferably a cushionary flexible member such as felt, leather, and cloth and a thin sheet of plastic, rubber, etc., is usable. Thus, the flexible intermediate member 20 is interposed between the lens cell 2 and clamping member 11, so the lens cell 2 rotates with small frictional resistance force to the clamping member as compared with the case when rigid bodies contact each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens position adjusting and fixing device in an optical instrument.

2. Description of the Related Art In optical devices such as copying machines and facsimile machines that use lens components, it is important to be able to adjust the position of the lens for the purpose of magnification adjustment and focus adjustment, for example, when manufacturing the device. Such lens position adjustment requires positioning of the lens with extremely high precision, and it is also necessary to securely fix the lens after adjustment.

[Length] U support 4 For the above-mentioned purpose, a lens position adjusting and fixing device illustrated in FIGS. 1 to 4 has conventionally been used.

In the apparatus shown in FIG. 1, a cylindrical lens cell 2 holding an appropriate number of lenses 1 is fitted into a support bracket 3 supported by a main body (not shown) of an optical instrument, and the lens cell 2 A male thread 4 formed on the outer peripheral surface of the bracket 3 and a female thread 5 formed on the inner peripheral surface of the hole of the bracket 3 are screwed together. A ring 6 is screwed onto the male thread 4 of the lens cell 2 adjacent to the brackets 1 to 3, and the lens cell 2 is fixed to the bracket 3 by tightening this ring. When adjusting the position of the lens 1, the ring 6 is loosened, the lens cell 2 is rotated, and the lens 1 is moved together with the lens cell 2 in the optical axis direction X of the lens to adjust the position of the lens 1.

After adjusting the lens position, the ring 6 is tightened and turned on to identify the lens cell 2 and therefore the lens 1.

As mentioned above, when adjusting the position of the lens, the ring 6 is loosened, but if the center of gravity of the lens cell 2 is biased toward one side in the optical axis direction X than the bracket 3, then
For example, this lens cell 2 is slightly tilted in the direction indicated by arrow A in FIG. Therefore, when the ring 6 is tightened to fix the lens cell 2, there is a possibility that the lens cell 2 will move slightly, causing the cell 2 to move away from the optical axis direction. Therefore, normally, the lens 1 cannot be correctly positioned at a predetermined position unless the position adjustment operation of the lens 1 is repeated several times.

The conventional lens position adjustment and fixing device shown in FIG. 2 also has a support bracket 3 supported by the main body of the optical device, and the flange portion 7a of the flange member 7 is fixed to this with bolts, and the bracket 3 and the flange member A lens cell 2 holding a lens 1 is fitted into the hole formed in the hole 7 . At this time, the lens cells 2 are lined up and fitted into the inner peripheral surface of the hole of the flange member 7 with a slight gap.

The lens cell 2 shown in FIG. 2 is not formed with a male thread, but instead, an appropriate number of setscrews 8 that can be pressed into contact with the lens cell 2 are screwed into the cylindrical portion 7b of the flange member 7. By tightening the set screw 8, the lens cell 2.
Furthermore, the lens 1 can be fixed.

When adjusting the position of the lens, loosen the set screw 8 and move the lens cell 2 in the optical axis direction 1, the lens cell 2 is tilted together with the lens 1 in the direction of the arrow, and when the set screw 8 is tightened, the position of the lens l is not accurate. do not have. Also, adjust lens cell 2 to 1.
:(When adjusting the lens cell 2, the movement of the hand of the person operating the lens cell 2 directly determines the amount of movement of the lens cell 2, so precise lens position adjustment is not possible.Furthermore, it is not possible to fix the lens cell 2 after adjustment. When tightening screw 8 as much as possible,
The pressing force acts intensively on the peripheral surface of the lens cell 2 where the set screw 8 hits, distorting the lens 1 held by the lens cell 2 and deteriorating the lens performance. On the other hand, in the apparatus shown in FIGS. 3 and 4, the lens cell 2 that holds the lens 1 is fitted into the V groove 10 of the bracket 9, and the lens cell 2 that holds the lens 1 is fitted into the V groove 10 of the bracket 9. Pol 1-
A clamp member 11 fixed by 14 presses and holds the lens cell 2 against the groove 10. A long hole 12 is formed in the clamp member 11 and extends obliquely with respect to the optical axis direction X of the lens, and a pin 13 fixed to the lens cell 2 is slidably fitted into the long hole 12. There is. .

When adjusting the lens position, the lens cell 2 is rotated in the direction of arrow B by loosening the pole 1-14 to loosen the suppressing force on the lens cell 21\ by the clamp portion 411.

At this time, the pin 3 fixed to the lens cell 2 is guided by the elongated hole 12 bored in the clamp member 11 and moves in the C direction, so that the lens cell 2 rotates and moves in the optical axis direction X. . After adjusting the lens position, tighten the pole 1-14, press the lens cell 2 against the VglO of the bracket 9, and fix the lever together with the lens 1.

In this device, the clamp member 11 and the
Since the lens cell 2 can be held by the lenses 9 to 9, the risk of tilting the lens cell 2 as in the apparatus shown in FIGS. 1 and 2 can be suppressed.

Moreover, when the lens cell 2 is fixed by the clamp member 11, the clamp part (411) contacts the circumferential surface of the lens cell 2 over a wide area and suppresses this, so that the pressing force acting on the circumferential surface of the lens cell 2 is dispersed. death.

Therefore, distortion is less likely to be applied to the lens 1, and deterioration of lens performance can be kept to a minimum. (If there is even a slight play in the fitting part with the long hole j2 provided, when the lens cell 2 is rotated, the movement of the lens cell 2 in the optical axis direction [゛] It no longer follows the rotation of the lens cell, so it is difficult to move the lens 1 and 2 by the correct distance.
1 Difficulty] J. Ru2, and usually the lens cell 2 and the clamp parts 1, 1' ] l 11 Since it consists of a rigid body, the friction between both members 2, 11 when the lens cell 2 is rotated 11v- The force increases, and a large force is required to rotate the 1 nons cell 2.

Furthermore, in the apparatus shown in FIGS. 3 and 4, when the pole 1:14 is tightened to fix the clamp control, a couple of forces as shown by the arrows in FIG. 4 act on the clamp member 11.・As a result, the lens 1 and the lens cell 2, together with the clamp member 11, were displaced relative to the bracket 9, and the position of the lens was sometimes inaccurate.
.

In addition, Japanese Utility Model Publication No. 58-4083 proposes a lens position adjustment and fixing device in which a lens cell is placed on a plurality of chevron blocks and fixed by multiple twists. However, there is a disadvantage that the lens becomes complicated, and there is also a risk that distortion may occur in the lens due to the suppressing force of the screw.

■An object of the present invention is to reduce the drawbacks of the conventional art, to be able to adjust the lens position with a relatively small force, and to securely fix the lens after adjusting the lens position. It is an object of the present invention to provide a lens position adjusting and fixing device which can perform the following functions and does not deteriorate lens performance unlike conventional ones.

A second object of the present invention is to provide a lens position adjusting and fixing device that can prevent or suppress the clamp phase from shifting relative to the V-bracket when a lens cell is fixed by a clamp member.

Hereinafter, the structure of the present invention will be clarified by explaining actual examples thereof.

In FIGS. 5 and 6, the appropriate number f1. ! The cylindrical lens cell 2 that holds the lens 1 of if is
Insert it into the V-groove 10 of -9 and attach the bracket 1-! The clamp part 4411 for pressing the lens cell 2 is fixed to the bracket 9 by a bolt 1-14 or other release-saving means. Similar to the clamp portion shown in FIG. 3 and FIG. However, unlike the clamp part shown in FIGS. 3 and 4, no elongated hole is formed. Instead, a flexible The intermediate members 20 having the following are arranged in layers.

A spiral groove 21 made of, for example, a mat is formed on the outer peripheral surface of the lens cell 2, and an intermediate member 20 is inserted into this spiral groove 21.
By biting in, the two engage with each other.

(2) The bracket 9 is fixedly or slidably installed on the main body (not shown) of the optical III W.

To adjust the lens position, first loosen the bolt 14 to reduce the pressing force with which the clamp member 11 is pushing the lens cell 2 against the bracket 9 via the intermediate member 20. Next, when the lens cell 2 is rotated, the helical groove 21 provided in the lens cell 2 and the intermediate portion 21 that is bitten into this with a light pressing force act as a male screw and a female screw, and the lens cell 2 moves in the optical axis direction X.

After adjusting the position of lens 1, tighten ports 1 to 14.
It is good to fix the lens cell 2 to the V brackets 1 to 9.

As the intermediate member 20, it is preferable to use a flexible material with cushioning properties such as Fell 1-1 leather or cloth cutting material.In addition, thin sheets of plastic, rubber, etc. can also be used. The thickness of the intermediate portion 20 is also set appropriately, and usually this j1/thickness is set to, for example, 0.5 to 3.
Set it to about +no+, IL is good.

Further, if necessary, the intermediate portion (A20) may be fixed to the clamping member 11 with an adhesive or the like, so that it becomes difficult to perform lens adjustment work during BIJ, but the effect of clamping the lens cell 2 can be enhanced.

As described above, there is a flexible intermediate portion 4. between the lens cell 2 and the clamp portion 4LJ411. , J' 2 (] is present, so compared to Yanga where the rigid bodies are in contact,
The nozzle cell 2 is attached to the clamp member 11 and rotates with a small Jr friction resistance. In order to ensure this effect, when the rubber sheet 1-, which has relatively high friction, is used as an intermediate member, its thickness is made thinner to reduce the degree of C repulsion 71I that occurs between the rubber sheet and the lens cell 2. I? i (it is desirable to reduce vibrational forces).

When the clamp member 11 is tightened, r, I bJ
The intermediate member 20 having A property is spiral 1fil! 21 embedded.

The lens cell 2 is firmly fixed.

The pitch of the spiral grooves can be set appropriately as necessary. For example, when using a lens with a copying machine whose projection magnification is set to around 100%, the pitch is set to about 2 m+, and when the lens is used with a facsimile machine etc. at a reduced magnification. When used, 0,
The pitch can be set to about 5 nlIn.

The helical groove 21 can be formed by a normal thread cutting method, but in this case, there is no mating thread that engages with the helix iM, so there is no need to particularly consider the mating thread. Therefore, the shape, pitch, etc. of the helical grooves do not necessarily need to be as precise as when machining ordinary threads, and the helical grooves can be formed at low cost.

In addition, in the apparatus shown in FIGS. 5 and 6, the lens cell is fixed by the clamp member 11.
A locking means is provided to prevent the clamp member 11 from sliding against the bracket 9 when the clamp member 14 is tightened and opened. The locking means in this example includes a protrusion 2 on the clamp member 11, as shown in FIGS. 7 and 8.
3 is provided in a protruding manner, and this protrusion 23 fits into a hole 22 drilled in the V bracket 1-9 without wobbling. Therefore, even if a rotational force is applied to the clamp member 11 when the bolt 14 is tightened (= J digit), the clamp member 11 will not rotate relative to the bracket 9 because the protrusion 23 and the six 22 are fitted. Therefore, lens 1 and lens cell 2
(2) can be prevented from shifting by being attached to the bracket 9.

7 and 8 show a protrusion 23 and a hole 22 provided near the bolts 1 to 14 on one side, and a protrusion similar to (J) and a hole 22 provided near the bolt 14 on the other side. (It is preferable to provide them and fit them together.)

The protrusions 23 can be formed by so-called half-blanking, or after the clamp member 11 is manufactured, the protrusions may be fixed thereto to form the protrusions 2:1.5. Alternatively, a portion of the clamp portion 4411 may be bent to protrude and be used as the protrusion 23. When forming the protrusion 23 by half punching, it is possible to make the protrusion protrude to about 1/2 to 2/3 of the thickness of the clamp member. Furthermore, it is advantageous to make the protrusion 23 and the hole 22 rectangular or polygonal in shape rather than circular in order to reduce play.

It is of course possible to prevent the clamp member from shifting relative to the bracket by using an appropriate locking means other than the protrusion and hole.

In the present invention, a flexible intermediate member is interposed between the lens cell and the clamp member, and the lens cell is provided with a spiral groove that engages with the intermediate member. Since the lens is configured to move in the optical axis direction by the 1111 rotation, the lens cell can be rotated with a relatively small force. Moreover, since there is an intermediate part assembly, the clamp part 4) can be used even when the lens cell is rotated.
It is possible to virtually eliminate the play between J and the lens cell, so it is possible to prevent the two from shaking against each other without preventing it, and at the same time it is also possible to suppress the movement of the lens cell. Therefore, it is possible to easily make fine adjustments to the lens cell.On the contrary, by tightening the clamp member, the flexible intermediate member is inserted into the spiral groove, and the lens cell can be held firmly at 19".

At this time, it is also possible to suppress defects that cause distortion in the lens and degrade its performance. Furthermore, it is possible to prevent the structure of the device from becoming complicated.

Furthermore, if a locking means is provided, when the lens cell is fixed by the clamp member, it is possible to prevent or suppress the clamp member from shifting relative to the bracket, thereby eliminating or suppressing the drawback that the lens position is inaccurate. It is possible to reduce

[Brief explanation of the drawing]

1 and 2 are partial cross-sectional side views showing a conventional lens position adjusting and fixing device, respectively. FIG. 3 is a front view showing another conventional lens position adjusting and fixing device, and FIG. The drawings are a side view of FIG. 3, FIG. 5 is a front view of the lens position adjustment and fixing device according to the present invention, FIG. 6 is a partial cross-sectional view seen from below of FIG. 5, and FIG. The sectional view taken along the line ■-■ in Fig. 5, and Fig. 8 are the 71st...lens 2...lens cell 9...■bracket 1-10...V groove 11...clamp member 20... Intermediate member 21... Spiral groove Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6

Claims (2)

[Claims] (1) Hold the lens. Lens position adjustment J! has a lens cell and a clamp member for pressing the lens cell against the bracket, such as a bracket having a V groove into which the lens cell fits. 'furf fixing device, characterized in that a flexible intermediate part set is interposed between the lens cell and the clamp part (4), and the lens cell is provided with a helix fi& that engages with the intermediate member. The lens position adjustment and fixing device. (2) A lens position adjustment and fixing device having a lens cell for holding a lens, a bracket having a viIG into which the lens cell fits, and a clamp member for pressing the lens cell against the bracket 1, A flexible intermediate member is interposed between the lens cell and the clamp member, and the lens cell is provided with a spiral groove that engages with the intermediate member, and when the lens cell is fixed by the clamp member, the clamp member (2) The lens position adjustment and fixing device is characterized in that it is provided with a locking means for preventing the lens from shifting relative to the bracket 1-.