JP2565947Y2 - Connection device for FPC board and code plate of zoom lens barrel - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, a change in focal length due to zooming is detected by a code plate fixed to one or the other of a movable member and a fixed member, and a brush in contact with the code plate. The present invention relates to a connection device between a code plate of a zoom lens barrel and an FPC board which transmits the signal to a camera body via an FPC board.

[0002]

2. Description of the Related Art For example, in a lens barrel in which a cam ring is driven to rotate for zooming, as a means for detecting a focal length during zooming, a zoom code plate affixed to a fixed ring of a camera and a cam ring. A zoom brush that slides on a zoom code plate with rotation is used. Pattern contacts are formed on the zoom code plate, and during zooming, the zoom brush rotates along with the cam ring and slides on the zoom code plate, whereby focal length information according to the focal length is transmitted to the camera operation control circuit. Is output. Based on the focal length information, data corresponding to the focal length at that time is input from the data table prepared for each variable information to the camera operation control circuit.

In a zoom lens barrel having such a structure, a detected focal length signal is output to a camera operation control circuit via an FPC board (flexible board) connected to a zoom brush. The zoom brush and the FPC board are connected by soldering, which makes the operation troublesome and causes an increase in cost.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to provide a connection device which can easily perform a connection operation between the code plate and the FPC board based on the above awareness of the problem.

[0005]

[Summary of the Invention] The present invention which achieves the above object,
A change in focal length due to zooming is detected by a code plate fixed to one or the other of the movable member and the fixed member, and a brush in contact with the code plate, and this detected focal length information is transmitted to the camera body via the FPC board. In the zoom lens barrel, the brush is provided with an elastic FPC board contact leg separately from a contact portion with the code plate, and the FPC board contact leg is provided on a brush fixing member for fixing the brush. Elastic contact with the board insertion groove,
Insert the FPC board insertion groove of the brush fixing member and the FPC board into the FPC board.
The present invention is characterized in that an insertion portion to be inserted between the PC board contact leg is provided, and a contact land with the FPC board contact leg is provided in the insertion portion along the insertion direction.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
First, the entire zoom lens barrel to which the present invention is applied will be described with reference to FIGS.

[0007] A helicoid ring 12 is fixed to a fixed lens barrel 11 integrated with the camera body.
A male multi-thread screw 10a formed on the outer peripheral surface of the cam ring 10 is screwed to the second female multi-thread screw 12a. A female multi-thread screw 10b and an inner cam groove 10c are formed inside the cam ring 10, and a male multi-thread screw 13a of the front lens barrel 13 is screwed into the female multi-thread screw 10b. At the rear end of the cam ring 10, light-shielding plates 25 and 26 having openings 25d and 26d respectively corresponding to the apertures of the camera body are located, and positioning portions formed on the light-shielding plates 25 and 26 are formed. The guide portions 23b of the rectilinear guide 23 fixed to the camera body are fitted into the concave portions 25a and 26a and the positioning concave portion 15b of the rectilinear guide ring 15, respectively. Light-shielding plates 25 and 26 are provided on the linear guide ring
The cam ring 10 is fixed to the rectilinear guide ring 15 so as to be freely rotatable. The rectilinear guide 23 is fixed to a fixing member 24 fixed to the camera body by a screw 22 so that the guide portion 23b projects along the optical axis direction.

A shutter holding frame 13c to which a rear end of an annular shutter unit 16 is fixed is fixed to the front lens barrel 13. A helicoid ring 17 provided integrally with the inner peripheral portion of the shutter unit 16 has , The front group lens frame 18 holding the front group lens is screwed. Shutter unit 1
Numeral 6 indicates that the drive pin 16a is engaged with a driven pin 18a integrated with the front lens frame 18. Drive pin 16a
Is driven by an angle corresponding to the distance measurement signal from the distance measuring device, and this rotation is transmitted to the front group lens frame 18 via the driven pin 18a, and the front group lens frame 18 (the front group lens While L1) rotates, focusing is performed by moving in the optical axis direction. The shutter unit 16
The shutter blade 16b is opened and closed according to the luminance signal of the subject. In addition, 13f in FIG. 11 is a lens opening.

Rear lens frame 1 supporting rear lens L2
9 has a cam pin 19a projecting in the radial direction, and this cam pin 19a is fitted in the above-mentioned inner cam groove 10c formed on the inner surface of the cam ring 10. The rear lens group frame 19 and the shutter holding frame 13c are guided straight by a straight guide surface formed on the straight guide ring 15. FIG. 11 shows a rectilinear guide surface 15a of the rectilinear guide ring 15 and a rectilinear guide surface 19 of the rear group lens frame 19, which are engaged with each other.
b is shown.

The cam pin 19a of the rear lens frame 19 is provided with a recess 13 formed in the rear end face of the front lens barrel 13 during assembly.
b. This is because when the male multi-threaded screw 13a on the outer periphery of the front lens barrel 13 is screwed into the female multi-threaded screw 10b of the cam ring 10, the cam pin 19a is simultaneously engaged with the inner cam groove 10c.
It is a structure for fitting in. After assembly, the front lens barrel 13 is turned by the rotation of the cam ring 10 so that the multi-threaded screws 10b and 13a
, The rear lens frame 19 follows the cam groove 10c and moves independently in the optical axis direction.

That is, the zoom lens barrel having the above configuration has
When the cam ring 10 is rotationally driven, the cam ring 10 itself moves in the optical axis direction according to the relationship between the male multi-thread screw 10a and the female multi-thread screw 12a. At the same time, the female multi-start thread 10b and the male multi-start thread 1
3a and the linear guide mechanism of the shutter holding frame 13c and the linear guide ring 15, the front lens barrel 13
The (front lens L1) moves straight in the optical axis direction. When the cam ring 10 rotates, the inner cam groove 10c on the inner surface thereof rotates.
And a cam pin 19a provided on the rear lens frame 19,
Further, the rear group lens frame 19 (the rear group lens L2) is moved in the optical axis direction by the rectilinear guide mechanism of the rear group lens frame 19 and the rectilinear guide ring 15, and zooming is performed.

[0012] The cam ring 10 is located at a rear portion thereof,
A male multi-thread screw 10a and a plurality of parallel gears 10d
Are formed. The gear 10d has a cam ring 10
Composed of spur gears parallel to the axis of
0a is inclined in the same direction as the direction of the mountain,
d, a single thread 10a 'of the male multiple thread 10a
Are formed. In other words, the male multi-start thread 10a is
A portion in the circumferential direction is cut away except for a single thread 10a ', and a gear 10d is provided at the cut portion. In this embodiment, the multi-start screw 10a is a three-start screw, and a gear 10d is provided at a cut-off portion of the two start screws. These male multi-threaded screw 10a, single threaded thread 10a '
And the formed length s of the gear 10d in the axial direction is the same.

A cam ring 10 is provided on the inner surface of the helicoid ring 12.
Female multi-threaded screw 12a, a relief groove (not shown), and the like corresponding to the male multi-threaded screw 10a, the single thread 10a ', and the three-gear gear 10d, respectively. That is, the gear 10d is connected to the male multi-start thread 10a (the thread 10).
When the cam ring 10 rotates in accordance with the engagement between the female multi-threaded screw 12a and the female multi-threaded screw 12a, the cam ring 10 moves in the clearance groove without contact.

The helicoid ring 12 has a notch 12d on the side.
And a pinion (not shown) located in the notch 12d is engaged with the gear 10d. This pinion has an axial length capable of meshing with the three gears 10d at the same time. However, at the front moving end and the rear moving end of the cam ring 10, it meshes with only the rearmost and front gears 10d, respectively. . This pinion has a notch 1
It is located at a fixed position in 2d and is rotationally driven by a drive motor (not shown).

Next, the adjusting device will be described. The adjusting device includes a zoom mechanism that is zoomed by rotation of the cam ring 10 that is driven to rotate, and a zoom code plate (code) provided on the inner surface of the front lens barrel 13 that moves straight in the optical axis direction by the zoom mechanism. A brush support member 40 having a zoom brush (brush) 41 for detecting the current focal length by contacting the zoom code plate 36;
A brush position adjusting mechanism for adjusting the position of the brush support member 40 in the optical axis direction is provided.

As shown in FIG. 8, pattern contacts are formed on the zoom code plate 36. During zooming, the zoom code plate 36 advances and retreats in the optical axis direction together with the front lens barrel 13 to form a zoom brush. In order to change its position relative to 41, a digital signal (focal length information) corresponding to the current focal length is output to a camera operation control circuit (not shown) based on this. Based on the focal length information, data corresponding to the focal length at that time is input from the data table prepared for each variable information to the camera operation control circuit.

An insertion groove 13e is formed in a part of the inner peripheral surface of the front lens barrel 13 in parallel with the optical axis O. One end of a zoom code plate 36 is provided on the photographing opening 13f side of the insertion groove 13e. An engagement projection 13d for engaging a positioning hole 36a formed in the portion is formed. Zoom code board 3
The position of 6 is determined in parallel with the optical axis direction by engaging the positioning hole 36a with the engaging protrusion 13d, and the back surface is attached and fixed to the insertion groove 13e.

As shown in FIG. 2, the brush support member 40 is made of a synthetic resin material formed in an inverted L-shape when viewed from the side, and abuts a support portion 15c formed on a part of the straight guide ring 15. It has a contact portion 40b to be positioned and a positioning portion 40c for positioning and supporting the four zoom brushes 41 corresponding to the pattern contacts of the zoom code plate 36. Support part 15
c has an insertion hole 33 into which the mounting screw 31 is inserted, and the contact portion 40b has a female screw hole 40a corresponding to the insertion hole 33. The zoom brush 41 has an elastic output terminal that is to be in contact with the terminal 37a of the flexible board (FPC board) 37 when the brush support member 40 is attached to the support (brush fixing member) 15c by the attachment screw 31. (FPC board contact leg) 4
1a is provided at one end, and an input-side terminal (contact portion) 41b slidably in contact with the zoom code plate 36 is provided at the other end.

A spring insertion hole 32 is formed in the support portion 15c so as to be adjacent to the screw insertion hole 33 and penetrates toward the contact portion 40b similarly to the screw insertion hole 33. In the spring insertion hole 32, the separation spring 30 having one end in contact with the brush support member 40 and the other end in contact with the light shielding plate 26 is contracted, so that the brush support member 40 is attached to the support portion 15c. In the supported state, it is urged in a direction away from the support portion 15c. Thereby, the brush support member 40
When the mounting screws 31 are supported by the support portion 15c,
Is rotated in an appropriate direction and tightened or loosened.
The brush support member 40, that is, the input terminal 41b can be slid with respect to the zoom code plate 36 in accordance with the amount of rotation of 1. Therefore, the separation spring 30 that urges the brush support member 40 in the direction of separating the brush support member 40 from the support portion 15c.
And a mounting screw 31 for supporting the brush supporting member 40 on the supporting portion 15c against the separating spring 30, a brush position adjusting mechanism is configured.

As shown in FIG. 1, one of the three rectilinear guide surfaces 15a having the support portion 15c is formed with a sliding groove 38 for accommodating a brush support member 40 and a zoom brush 41. I have. The sliding groove 38 is formed to have substantially the same size as the width of the brush support member 40, and a regulating wall 39 is formed at a substantially central portion thereof.

Further, a flat surface (FP) is formed outside the support portion 15c.
C substrate insertion groove) 15e is formed.
5e, an output terminal 41a (FP) of the zoom brush 41 is provided.
C board contact leg) is elastically contacted. The terminal portion 37a provided on the flexible board 37 constitutes an insertion portion inserted between the flat surface 15e and the output terminal 41a.
7a is provided with a contact land 37b with the output terminal 41a along the insertion direction.

When the zoom brush 41 is mounted on the slide groove 38, first, the output terminal 41a is connected to the flat surface 1a.
5b, the brush support member 40 is fitted into the slide groove 38, and the vicinity of the input terminal 41b of the zoom brush 41 is brought into contact with the back surface of the regulating wall 39. At this time, the terminal portion 37a can be inserted and sandwiched between the output terminal 41a and the flat surface 15e. Thus, the zoom brush 41 can be easily and reliably connected to the flexible board 37 communicated to the camera operation control side.

This connection state is shown in FIGS. In FIG. 3, the sliding groove 38 is formed in a substantially U-shape opened upward in the figure, and the terminal portion 37 a of the flexible substrate 37 is formed.
Is supported only by the flat surface 15e and the output side terminal 41a, but as shown in FIG. 4, the lowermost portions of the left and right inner walls of the sliding groove 38 are widened left and right by a predetermined amount to form an engaging groove 38a, It can be configured to more reliably prevent the inconvenience that the terminal 41a floats upward. Further, the engagement groove 38a shown in FIG.
Instead, a dovetail-shaped engaging groove 38 as shown in FIG.
Even when the b is formed, it is possible to prevent the output-side terminal 41a from rising, as in the case of the engagement groove 38a.

The support portion 1 shown in FIGS.
Guide protrusions 40d formed on the left and right of the brush support member 40 are slidably inserted into guide holes 15d formed on the left and right of 5c. Thus, the input terminal 41b can be slid very smoothly with respect to the zoom code plate 36 without being displaced.

[0025]

As described above, according to the present invention, the code plate and the FPC board can be easily and reliably connected to each other without any troublesome work such as soldering, so that the connection work is greatly simplified. The cost can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of a device for connecting a code plate and an FPC board according to the present invention.

FIG. 2 is a side sectional view showing a main part of a connection device between the code plate and the FPC board.

FIG. 3 is a diagram of a main part of a connection device between the code plate and the FPC board in FIG. 2 as viewed from the rear side of the optical axis.

FIG. 4 is a diagram showing a main part of the connection device for the FPC board, viewed from the rear side of the optical axis, in which the sliding groove of FIG. 3 is partially changed.

5 is a diagram showing a main part of the connection device for the FPC board, viewed from the rear side of the optical axis, in which the sliding groove of FIG. 3 is partially changed.

FIG. 6 is a perspective view showing a zoom code plate arrangement structure on the inner surface of a front lens barrel.

FIG. 7 is a view of the main part of FIG. 6 viewed from above.

FIG. 8 is a diagram showing a zoom code plate alone.

FIG. 9 is a sectional view showing an example of a zoom lens barrel.

FIG. 10 is a sectional view of a main part of the zoom lens barrel of FIG. 9;

11 is an exploded perspective view of a main part of the zoom lens barrel in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cam ring 11 Fixed lens barrel 12 Helicoid ring 13 Front lens barrel 15 Straight guide ring 15a Straight guide ring 15c Supporting part (brush fixing member) 15e Flat surface (FPC board insertion groove) 16 Shutter unit 17 Helicoid ring 19 Rear group lens Frame 23 Straight guide 36 Zoom code board (code board) 37 Flexible board (FPC board) 37a Terminal part (insertion part) 37b Contact land 38 Sliding groove 38a Engaging groove 38b Engaging groove 39 Regulation wall 40 Brush support member 40b Contact part 40c Positioning part 41 Zoom brush (brush) 41a Output terminal (FPC board contact leg) 41b Input terminal (contact part) L2 Rear lens L1 Front lens

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-112715 (JP, U) JP-A 1-109129 (JP, U) JP-A 61-183036 (JP, U) JP-A 59- 164204 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A focal length change caused by zooming is detected by a code plate fixed to one and the other of a movable member and a fixed member, and a brush contacting the code plate, and the detected focal length information is detected by a camera via an FPC board. In the zoom lens barrel transmitting to the body side, an elastic FPC board contact leg is provided on the brush separately from a contact portion with the code plate, and the FPC board contact leg is fixed to a brush for fixing the brush. The FPC board insertion groove of the brush fixing member and the FPC board insertion groove
A code plate for a zoom lens barrel, comprising: an insertion portion inserted between a PC board contact leg; and a contact land with the FPC board contact leg provided in the insertion portion along an insertion direction. And FPC board connection device.