JPS5987413A - Moving device of lens - Google Patents

Abstract

PURPOSE:To prevent backlash in an optical axis direction by pressing and engaging an engaging member having a trapezoidal sectional shape in the rectangular direction to the longitudinal direction of a guide groove and allowed to be engaged with the guide groove at its opposed inclined planes always to/ with the guide groove by an exciting means. CONSTITUTION:A circular truncated cone type cam follower 19 set up so that the diameter (ld) of its small diameter part is smaller than the groove width W of a cam groove 16 and the diameter D of a large diameter part is larger than the groove width W is fitted loosely and slidably to an axis 18 and pressed from the lower part to a cam groove 16 by a plate spring 20 so that the opposed inclined planes are engaged with the cam groove 16. If a moving lens barrel 12 is turned against a fixed lens barrel 11, the cam groove 16 is moved against the cam follower 19 and the lense barrel 12 is moved in the optical axis X direction while being turned. Even if the accuracy of the groove width W is low, the lens barrel 12 is prevented from the generation of backlash in the optical axis X direction because the cam follower 19 is always pressed to the cam groove 16 at the opposed inclined planes.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application 4 minutes v) The present invention relates to a lens moving device β in a lens barrel.

Structure of the conventional example and its problems A conventional lens moving device W is shown in FIGS. 1 and 2. That is, 1t+ is transferred to the outer periphery of the fixed lens barrel (1).
+ hrg cylinder (2) is printed! Il) + [It is fitted to the TI function, and this transfer lρJ mirror 1jj 12) is its y;
They hold Rennes (3) in the 61st division.

If the same (I) (this pin (4) is used as gi, this pin (4) is moved dυ1 sharp 1111i
Is it now against the optical axis (3) on the side of l L2)? It engages with a cam groove (5) provided in the opposite direction. When the movable lens barrel (2) is displaced by 2 times 1iiJ, the movable lens barrel (2) moves in the direction of light 'II:α) according to the cam groove (5).

Roll up DV.

The conventional lens moving device has a fixed lens barrel (1).
1. Move the optical axis (3) of the lens barrel (2) to the same width, and cut the γ1° width of the force l and the longitudinal direction (5) to the diameter of the bottle (4). [τ′;] by making someone
+r6 has been collected. Therefore, if the groove (5) is made of plastic, etc., then
Since the 11"fl (E) of 11t deteriorates, there is a problem in that play in the optical axis (3) direction increases.

The purpose of the invention is to eliminate the above-mentioned conventional drawbacks, and an object of the invention is to provide a lens moving device that can prevent backlash in the optical axis direction even if the width of the guide groove is poor. .

Structure of the Invention In order to achieve the above object, the lens moving device of the present invention includes a first cylindrical body having a guide groove formed diagonally in the optical axis direction on the side surface, and a first cylinder body having a guide groove formed diagonally in the optical axis direction; The first guide 11★ has a trapezoidal cross-sectional shape in a direction perpendicular to the longitudinal direction, and has a retaining member that can engage with the front We guide groove on its opposing slope, and is fitted into the cylinder of nIJIIl. A1 holds the engagement member flfJ; 0i1 the first cylindrical body; A biasing means is interposed between the contact body and the guide groove, and presses the engaging member into the guide groove to engage the facing surface of the engaging member with the guide groove indicated by I'+tJ. The engaging member of the second cylindrical body with respect to the guide shaft of the first f8i body has a trapezoidal cross section, and this retaining member is constantly pressed against the guide r4'Aj by the biasing means. By engaging with opposing slopes, cuffing in the optical axis direction is prevented.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be explained based on the drawings.
, reveal.

In Figures 8 and 4, 0υ is strictly 1.02
is a movable main trunk that is freely fitted on the fixed hood trunk Qυ, a
4 is held in a lens holding part Q formed on the inner peripheral surface of one end of the movable lens barrel (1) and fixed by a lens holding frame OQ.
f-sa FL? , : Move the lens, Ql i,'h Mirror 11M A long hole-shaped cam groove formed on the side surface of JJ2 in a diagonal direction with respect to the light 1i111X1 direction, 07) is provided in a part of the outer periphery of the fixed lens barrel 0υ. In the recessed part, a camphor that faces the force l groove 04 circle of the transfer side lens barrel (6) is planted in this four part α force. Is θ the truncated circle sister no 1? and
Is the ml diameter (d) of the small diameter part of the eye and thorax 1 of force l - groove 0?
11 width (5), and the diameter (D) of the large diameter part is the above-mentioned 6
It is a cam follower with iY width (~ larger than usual, and is inserted from the large diameter part (IIl) into 4qi + a) 9 of the above-mentioned 4 parts 07, and is slidable (and loosely fitted) with respect to the shaft Q frame. .The wire is inserted with cam follower ゛] θ and Φ1110 wire 1, and it is located in the fourth part α, and the cam follower 09
The lower blade of the blade presses against the cam groove θ[-, and the urging force causes the opposing ♀ and 1 faces of the cam follower θ1 to be pushed into the cam tjM L
It is engaged with IG. In addition, although we used a cam follower with a circular cross section, it is not limited to this, and the cam groove (which is rumored to have a trapezoidal cross-sectional shape in the direction perpendicular to the longitudinal direction) In the above configuration, the movable nail with respect to the fixed lens barrel 0υ! IJf-J Qa to Ir1
When the i 11tlI is raised, the cam fji (m) moves against the cam wheel 1J, thereby moving the movable mirror 11iii.
i (I is 11 times I L/ iL is moved in the direction of the optical axis (i1Q+). At this time, for example, if the cam groove 0Q is implanted by plastic molding etc., the accuracy of the groove width (b) is Even if the cam wheel 1 is engaged with the cam groove 09 on the opposite ♀ 1 side, the cam wheel 1 is always forced to press the cam groove. Therefore, the γ-motion lens barrel 02
A cuff in the optical axis (3) direction does not occur at 3°.
' = explained gt7 g In the example, the inside 1 Myocho (1
Let υ be 1 self-determined, ri) 0 river's 05' mouth j same (move l's d
In this case, the opposite groove Jiy, that is, the inner nail, ξl1lidθ1) is exported as i+cant:, and the outer (IIl, l lens barrel (lη is hard crab)). Inside (j
It goes without saying that the lens θ may be held in the lens barrel Uυ of the ilj.

Effects of the Invention As described above, according to Kinoshita...1, the engaging member that engages with the guide groove on the opposite slope is always pressed against the guide groove by means of the first force. Even if the width of the groove rv is 1 bubble, the backlash in the optical axis direction can be compared to KQ, and therefore the guide γ,'? Add L and engaging member by plastic molding.
It has become an ability to do so, and it is inexpensive and mass-producible. ¥1
Move the lens dl # l,! 1.
,

[Brief explanation of drawings]

Fig. 1 is a half part e11 diagram of the conventional example, Fig. 2 is a plan view of the main part in Fig. 1, Fig. 8 is a longitudinal sectional view of the half part showing Embodiment 11 of Kizuko Akira, and Fig. 4 is a half part e11 diagram of the conventional example. Figure 8) 1st wave r: I
< 0) ``f' If!
Oa -... transfer [11JfR, l IIl same, 0:
l-lens, (1'9...cam?;1'?, ,
On...JJ l, Poro 7, (to)...Itabawa,
(X)... Hikari Kurumayamadai r (1i person blind 1 tree ^(Hiro 1 Figure 9 Figure 4)

Claims (1)

[Claims] 1, <1'l + mouth 1 light 1 forward direction nujj t,
a first cylindrical body in which a 45 inner 11'6 is formed in an oblique direction;
N: J Nshi' is guided along a guide groove and has a trapezoidal cross-sectional shape in a direction 1α angle with respect to the longitudinal direction of this guide groove, and the remaining one surface facing the guide groove is shaped like a trapezoid. an engaging member that is inserted into the cylindrical body of @) 1 to hold the engaging member and the first cylindrical body and relatively The second cylindrical body that is to be moved is interposed between the engaging member and the second cylindrical body, and the mating member described above is pressed and opened. 1 (Engagement 8), a lens moving device having a force means for engaging the opposite surface of the material with the guide groove.