JP4623997B2 - Lens barrel device - Google Patents

Description

  The present invention relates to a lens barrel device provided with a rectilinear advance restriction member according to the number of lens groups.

2. Description of the Related Art Conventionally, in a lens barrel that drives a first lens group and a second lens group by a cam cylinder, a first lens group holding frame (first lens cylinder) and a second lens group are held from one end of the cam cylinder. A frame (second lens barrel) was incorporated (see, for example, Patent Document 1).
In this case, each lens group holding frame (lens cylinder) is fitted with the same rectilinear regulation member (float key) that prevents rotation and allows movement in the optical axis direction at a predetermined position. It was not so difficult.
JP-A-5-249360

However, due to the diversification and miniaturization of lenses, recently, there has been a case where each lens group holding frame cannot always be fitted to one rectilinear regulating member.
For this reason, it is necessary to prepare a straight-advancing restricting member for each lens group. In this case, since there is no relation between the lens groups, positioning is difficult, and there is a problem that time and labor are required for assembly.

  SUMMARY OF THE INVENTION An object of the present invention is to facilitate positioning of each lens group holding frame with respect to a cam cylinder in a lens barrel device provided with a straight advance restricting member according to the number of lens groups, and to reduce assembly time and labor. .

In order to solve the above-described problems, the present invention , as shown in FIGS. 1 to 4, for example, transmits at least the first and second lens groups L1 and L2 and the first and second lens groups L1 and L2. A cam cylinder 7 having cam grooves 71 and 72 that are moved while changing the interval in the axial direction, and a first lens group linear movement restricting member that prevents the rotation of the first lens group L1 and enables movement in the optical axis direction. 8, the second lens group linear movement restricting member 9 that prevents the rotation of the second lens group L2 and enables movement in the optical axis direction, the first lens group L1, the cam groove 71, and the first lens. The first lens group holding frame 1 and the second lens group L2 which are respectively engaged with the group linear movement restricting member 8 and are incorporated into the cam cylinder 7 from one end are held, and the cam groove 72 and the second lens group linear advance. Engage with the restricting member 9 and set the cam cylinder 7 from the other end. A lens barrel device including a second lens group holding frame 2 to be inserted, and positioning for positioning the first lens group holding frame 1 and the second lens group holding frame 2 in the cam grooves 71 and 72 during assembly. Projections 73 and 74 are formed.

According to the present invention , the first lens group holding frame that engages with the first lens group linear movement restricting member is incorporated into the cam cylinder from one end, while the second lens that engages with the second lens group linear advance restriction member. By incorporating the group holding frame into the cam cylinder from the other end, the first lens group holding frame and the second lens group holding frame are respectively positioned on the positioning protrusions of the cam groove.

The present invention is a lens barrel device, and for example, as shown in FIGS. 2 and 3, the first lens group holding frame 1 and the second lens group holding frame 2 are urged away from each other. The biasing means S is interposed.

According to the present invention , the first lens group holding frame and the second lens group holding frame are urged in the direction away from each other by the urging means therebetween, so that The first lens group holding frame and the second lens group holding frame are each held in a positioned state.

The present invention relates to a lens barrel device. For example, as shown in FIGS. 2 and 3, the first lens group holding frame 1 and the second lens group holding frame 2 have an inner peripheral side and an outer peripheral side with respect to the cam barrel 7. It is characterized by being divided into two sides.

According to the invention , the first lens group holding frame and the second lens group holding frame are incorporated into the inner side and the outer side separately from the cam cylinder, so that the first lens group holding frame and the second lens group are incorporated. The holding frame can be individually incorporated into the cam cylinder without interfering with each other.

The present invention is a lens barrel device. As shown in FIGS. 1 and 4, for example, a first lens group positioning projection 73 and a second lens group positioning projection 74 are provided for cam grooves 71 and 72, respectively. It is characterized by being formed in opposite directions.

According to the present invention , the first lens group positioning protrusion and the second lens group positioning protrusion are formed in directions opposite to each other with respect to the cam groove. The first lens group holding frame and the second lens group holding frame are positioned and held by the biasing means.

  According to the present invention, the first lens group holding frame that engages with the first lens group rectilinear restriction member is incorporated into the cam cylinder from one end, and the second lens group that engages with the second lens group rectilinear restriction member. By incorporating the holding frame into the cam cylinder from the other end, the first lens group holding frame and the second lens group holding frame can be easily positioned on the positioning protrusion of the cam groove, so that the time required for assembly can be reduced and labor can be reduced. Can be reduced.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
1 to 4 showing the configuration of an embodiment of a lens barrel device to which the present invention is applied, C is an image sensor, L1 is a first lens group, L2 is a second lens group, L3 is a third lens group, 1 is a first lens group holding frame, 2 is a second lens group holding frame, 3 is a third lens group holding frame, 4 is a fixed barrel, 5 is a rotating barrel, 6 is a straight barrel, 7 is a cam barrel, and 8 is a first barrel Reference numeral 9 denotes a linear movement restricting member for one lens group, and reference numeral 9 denotes a straight advance restriction member for the second lens group.

  In FIG. 2, the fixed cylinder 4 is provided in a camera body (not shown), and the helicoid gear 51 on the outer periphery of the rotating cylinder 5 is engaged with the helicoid gear 41 on the inner periphery of the fixed cylinder 4. Further, the gear 52 on the outer periphery of the rotating cylinder 5 is engaged with a gear 42 installed outside the fixed cylinder 4. Thereby, the rotating cylinder 5 is movable in the optical axis direction while rotating. As shown in FIG. 1, the helicoid gear 51 and the gear 52 of the rotating cylinder 5 constitute a drive unit.

  A rectilinear cylinder 6 is fitted in the rotating cylinder 5, and the rectilinear cylinder 6 can be linearly moved in the optical axis direction without rotating when the engaging portion 61 engages with the key groove 46 of the fixed cylinder 4. It has become. A connecting piece 76 protruding from the outer periphery of the cam cylinder 7 is inserted into the insertion groove 62 of the rectilinear cylinder 6. The connecting piece 76 is engaged with a cam cylinder driving rectilinear groove 56 on the inner periphery of the rotating cylinder 5. Thereby, when the rotating cylinder 5 rotates, the cam cylinder 7 also rotates in the same manner.

  The cam cylinder 7 serving as a rotation driving member has a first lens group cam groove 71 formed on the outer periphery and a second lens group cam groove 72 formed on the inner periphery. The first frame 11 protruding to the inner periphery of the first lens group holding frame 1 is engaged with the first lens group cam groove 71 whose end is opened to the front end side of the cam cylinder 7. Further, the second frame 21 protruding from the outer periphery of the second lens group holding frame 2 is engaged with the second lens group cam groove 72 whose end is opened to the rear end side of the cam cylinder 7. The first lens group cam groove 71 and the second lens group cam groove 72 are formed with positioning projections 73 and 74 corresponding to the assembled positions at the time of assembly in opposite directions.

  Further, a first lens group rectilinear regulating member 8 is arranged on the outer peripheral side of the cam cylinder 7, and a second lens group rectilinear regulating member 9 is arranged on the rear end side of the cam cylinder 7. The engaging portion 83 that protrudes to the outer periphery of the first lens group rectilinear restriction member 8 engages with the rectilinear groove 63 on the inner periphery of the rectilinear cylinder 6 and projects to the outer periphery of the second lens group rectilinear restriction member 9. The engaging portion 94 is engaged with the rectilinear groove 64 on the inner periphery of the rectilinear cylinder 6. As a result, the first lens group rectilinear regulation member 8 and the first lens group rectilinear regulation member 9 do not rotate, but can only travel in the optical axis direction.

The first lens group holding frame 1 is disposed between the cam cylinder 7 and the first lens group straight-ahead regulating member 8. The engaging portion 12 protruding from the outer periphery of the first lens group holding frame 1 is engaged with the rectilinear groove 82 on the inner periphery of the first lens group rectilinear regulating member 8.
The second lens group holding frame 2 is disposed inward of the cam cylinder 7, and a rectilinear lever 92 protruding forward from the first lens group rectilinear regulating member 8 is engaged with the rectilinear groove 22 on the outer periphery. is doing. Between the second lens group holding frame 2 and the first lens group holding frame 1, as shown in FIG. 2, a biasing means S by a coil spring that biases in a direction away from each other is interposed.

With the above configuration, the first lens group holding frame 1, the second lens group holding frame 2, the rectilinear cylinder 6, the first lens group rectilinear regulating member 8 and the second lens group rectilinear regulating member 9 do not rotate, It can only go straight in the direction of the optical axis.
As described above, the rotating cylinder 5 and the cam cylinder 7 are movable in the optical axis direction while rotating.

In the above, the third lens unit L3 is a lens for autofocus (AF) and is driven by another motor (not shown).
Here, FIG. 4 shows a state where the first frame 11 is engaged with the first lens group cam groove 71 and a state where the second frame 21 is engaged with the second lens group cam groove 72. Tele positions are indicated by 11t and 21t, wide positions are indicated by 11w and 21w, and storage positions are indicated by 11 and 21, respectively. In the illustrated example, in the first lens group cam groove 71, a positioning protrusion 73 is provided immediately before the tele position 11t near the open end, and in the second lens group cam groove 72, the open end is provided. A positioning projection 74 is provided at a position immediately after the tele position 21t far from the position.

The above-described lens barrel device incorporates the first lens group holding frame 1 from the front end side (subject side) with respect to the cam barrel 7 while assembling the second lens group holding frame 2 with respect to the cam barrel 7 at the time of assembly. Incorporate from.
That is, the first frame 11 on the inner periphery of the first lens group holding frame 1 is engaged with the first lens group cam groove 71 from the open end on the front end side of the outer periphery of the cam cylinder 7, while the second lens group holding frame is engaged. The second frame 21 on the outer periphery is engaged with the second lens group cam groove 72 from the open end on the rear end side of the inner periphery of the cam cylinder 7.

At this time, since the first lens group holding frame 1 and the second lens group holding frame 2 are urged in a direction away from each other by the urging means (coil spring) S, the first frame 11 and the second frame 21 are The first lens group cam groove 71 and the second lens group cam groove 72 are held in the positioning state by the positioning protrusions 73 and 74 at the assembled positions in the opposite directions.
Thus, when the first lens group holding frame 1 and the second lens group holding frame 2 are stopped at the assembled position with respect to the cam cylinder 7, the first lens group L1 and the second lens group L2 can be easily combined.
Therefore, the time required for assembly can be shortened and labor can be reduced.

In the above embodiment, the coil spring is used as the biasing means. However, the present invention is not limited to this, and another spring or a member having a similar function may be used.
Moreover, the shape of the positioning protrusion and the like are arbitrary, and it is needless to say that other specific detailed structures and the like can be appropriately changed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view illustrating a configuration of a lens barrel device according to an embodiment to which the present invention is applied. It is the vertical side view which showed the wide state of the lens-barrel apparatus by the components structure of FIG. It is the vertical side view which similarly showed the tele state. It is the expanded view which shows the cam groove of a cam cylinder, and is the figure which showed the cam groove of the other surface side in the see-through state.

Explanation of symbols

C Image sensor L1 First lens group L2 Second lens group L3 Third lens group S Energizing means 1 First lens group holding frame 11 First frame 12 Engaging portion 2 Second lens group holding frame 21 Second frame 22 Straight ahead Groove 3 Third lens group holding frame 4 Fixed cylinder 41 Hayricoid gear 42 Gear 46 Key groove 5 Rotating cylinder 51 Hayricoid gear 52 Gear 56 Cam cylinder driving rectilinear groove 6 Rectilinear cylinder 61 Engaging portion 62 Insertion grooves 63 and 64 Straight groove 7 Cam cylinder 71 First lens group cam groove 72 Second lens group cam groove 73 First lens group positioning protrusion 74 Second lens group positioning protrusion 76 Connecting piece 8 First lens group rectilinear restriction member 82 Straight advancing groove 83 Engaging portion 9 Second lens group rectilinear regulating member 92 Rectilinear lever 94 Engaging portion

Claims (2)

At least first and second lens groups;
A cam cylinder having cam grooves for moving the first and second lens groups while changing the interval in the optical axis direction;
A first lens group rectilinear regulating member that prevents rotation of the first lens group and enables movement in the optical axis direction;
A rectilinear regulation member for the second lens group that prevents the rotation of the second lens group and enables movement in the optical axis direction;
A first lens group holding frame that holds the first lens group, engages with the cam groove and the first lens group linear advance restriction member, and is incorporated into the cam cylinder from one end;
A second lens group holding frame that holds the second lens group, engages with the cam groove and the second lens group linear advance restriction member, and is incorporated into the cam cylinder from the other end;
Between the first lens group holding frame and the second lens group holding frame, an urging means for urging in a direction away from each other in the optical axis direction is interposed.
Forming a first lens group positioning projection and a second lens group positioning projection for positioning the first lens group holding frame and the second lens group holding frame at the time of assembly in the cam groove;
A lens barrel device, wherein the first lens group positioning projection and the second lens group positioning projection are formed in directions away from each other in the optical axis direction.   2. The lens barrel device according to claim 1, wherein the first lens group holding frame and the second lens group holding frame are assembled separately on the inner peripheral side and the outer peripheral side with respect to the cam barrel.

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