JP3212202B2 - Interchangeable lens barrel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interchangeable lens barrel, and more particularly, to an interchangeable lens barrel having a flexible printed circuit board in the lens barrel.

[0002]

2. Description of the Related Art Conventionally, various types of interchangeable lens barrels have been proposed. Hereinafter, a conventional example will be described with reference to FIGS.

FIG. 12 is a cross-sectional view of an interchangeable lens barrel showing one prior art (hereinafter referred to as a first prior art) disclosed in Japanese Patent Application Laid-Open No. 1-296205.

In this interchangeable lens barrel, a mount contact block 101 electrically connected to a mount on the camera body side is provided near the mount portion. The mount contact block 101 holds the mount contact pin 101a. The member 101b is integrally formed.
In front of the mount contact block 101, a hard double-sided printed board 102 on which a circuit for driving and controlling an autofocus driving motor 103 and an aperture driving motor 104 is mounted. This printed circuit board has a donut shape in which a hollow portion is formed in a light beam passing range.

The mounting contact block 101 and the hard double-sided printed board 102 are
5, and is connected to the mount contact block 101 by soldering in a direction perpendicular to the optical axis as shown in the figure.

FIG. 13 is another prior art disclosed in Japanese Patent Application Laid-Open No. 2-7593 (hereinafter referred to as a second prior art).
FIG. 4 is a cross-sectional view of the interchangeable lens barrel shown in FIG.

In this interchangeable lens barrel, a mount contact block 106 for electrically connecting to a mount on the camera body side is provided in the vicinity of the mount portion. Similar to the printed circuit board 102, a hard double-sided printed board 107 having a circuit for driving and controlling an autofocus driving motor 108 and an aperture driving motor 109 is provided.

The rigid double-sided printed circuit board 107 and the mounting contact block 106 are directly electrically connected as shown in the figure, but the hard double-sided printed circuit board 107 is connected to the optical axis similarly to the first prior art. The mounting contact block 106 is connected by soldering in a direction perpendicular to the mounting direction.

FIG. 14 shows a prior art disclosed in Japanese Utility Model Publication No. Sho 62-37207 (hereinafter referred to as a third prior art).
FIG. 1 is a cross-sectional view of a main part of the interchangeable lens barrel, showing FIG.
FIG. 5 is an enlarged perspective view of a main part of the main part of the interchangeable lens barrel shown in FIG.

As shown in the figure, this interchangeable lens barrel is
A plurality of mounting contact pins 110 made of a conductive material are provided, each of which is screwed and held by the mounting contact block 111. The mount contact block 1
Reference numeral 11 denotes a plurality of openings 111a and 111b corresponding to the number of the mounting contact pins 110 in two directions parallel to and perpendicular to the optical axis. The mounting contact pins 110 are provided on one of the openings 111a. Are screwed into each other, each shaft of the contact pin 110 is connected to the other opening 111b.
Is to be expressed.

On the other hand, from the front side of the interchangeable lens barrel, a flexible printed circuit board C112 extends to a mount contact block 111 as shown. The connection between the flexible printed circuit board 112 and the mounting contact block 111 is performed by connecting the conductive pattern formed on the connecting portion 112a of the flexible printed circuit board 112 with the opening 111b of the mounting contact block 111 as shown in FIG.
The shaft portions of the mount contact pins 110 are brought into contact with each other and are fixed by fixing screws 114 with the insulating rubber 113 therebetween.

[0012]

However, in the first prior art disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 1-296205, as described above, the flexible printed circuit board 105 is connected to the mount contact block 101 with respect to the optical axis. are connected by soldering in a direction perpendicular, end 1 of the flexible printed circuit board in this connection scheme
It is more likely that the protrusion 05a protrudes toward the inner diameter side in the optical axis direction with respect to the inner diameter surface 101c of the mount contact block.

FIG. 16 shows the general size of the pattern on the flexible printed circuit board side when soldering the mount contact pins 101a and the flexible printed circuit board 105 as described in the first prior art. In the drawings, the numbers indicated by arrows indicate dimensions in (mm). In the drawing, reference numeral 117 denotes a hole into which the connection portion 101d of the conductive metal pin 101a corresponding to the mount contact pin is inserted.
Reference numeral 115 denotes a copper foil pattern portion, which has an exposed portion of 0.7 mm copper foil from the end face of the hole 117 to maintain the strength of soldering. Prevents detachment from the polyimide base. Reference numeral 116 indicates an end face of the coverlay film. Reference numeral 118 denotes an outline, which corresponds to the end portion 105a of the flexible printed circuit board in the first related art.

As can be seen from FIG. 16, when the connection method as shown in the first prior art is adopted, the distance from the edge of the hole of the flexible printed circuit board in which the mounting contact pins 101a are inserted to the outline is About 1.4 mm is necessary. For example, in the case of a large-aperture lens or a telephoto lens having a large rear lens diameter, when the rear lens frame occupies a space close to the inner diameter surface 101c of the mount contact block, a flexible printed circuit board End 105 of
a interferes with the rear lens frame.

In the second prior art disclosed in Japanese Patent Application Laid-Open No. 2-7593, the mounting contact pin 106
a and the printed circuit board 107 on both sides of the rigid board need to have a soldering pattern substantially equivalent to the dimensions shown in FIG.
7, the inner diameter 107a of the donut shape becomes smaller than the inner diameter 106b of the mount contact block, and as in the first prior art, interference occurs in a lens having a large rear lens diameter.

In the third prior art disclosed in Japanese Utility Model Publication No. Sho 62-37207, a crimping method is used as a connection method, so that an optimum structure for performing important wiring such as a power supply and GND is provided. Not really. Also, the number of parts increases, and the space in the lens radial direction is not minimized. Therefore, as compared with the above two known examples (first and second prior arts), the space for the electrical contacts is reduced but not minimized.

Further, the positioning of the flexible printed circuit board 112 and the mount contact block 111 is not particularly defined, and there is a possibility that a problem such as a displacement may occur.

The present invention has been made in view of such a problem, and an object of the present invention is to provide an interchangeable lens barrel which is small and capable of performing reliable positioning.

[0019]

In order to achieve the above object, an interchangeable lens barrel according to the present invention comprises a camera.
In freely interchangeable lens barrel detachably attached to the body, mosquitoes
Lens barrel side mount that is joined to the camera body side mount
Provided at the end of the camera
Multiple mounting contacts for electrical connection with the
The holding member for holding the mounting contact is integrally formed.
Mounting contact block and one end of the mounting contact
The mount formed and attached to the lens barrel
Project from the outside of the contact block to the lens barrel radial direction.
And a connection portion formed without being connected to the connection portion of the mount contact, the connection portion being disposed in the lens barrel and being fixed to the connection portion of the mount contact.
A flexible printed circuit board to have a conductive pattern exposed portions of electrically conducted by being, the Furekishibu
When connecting the printed circuit board and the mounting contacts,
The exposed portion of the conductive pattern is parallel to the optical axis of the lens barrel.
And the outer shape of the mounting contact block.
The exposed portion of the conductive pattern and the solid
Connection hand that firmly connects so that the attachment part does not protrude
And a step .

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of an interchangeable lens barrel showing a first embodiment of the present invention.

The interchangeable lens barrel according to the first embodiment has a rear group lens 1 held in a rear group lens frame 2 at the center thereof. The rear group lens frame 2 is screwed and fixed to the rear group drive frame 3 so as to perform an extension operation according to a subject distance. A lens-side mount 4 is provided at the rear end of the interchangeable lens barrel, and is joined to a camera body-side mount (not shown).

The lens-side mount 4 is fixed to a fixed frame 6 with mount fixing screws 5. A spacer 7 having an optimal thickness is interposed between the lens mount 4 and the fixed frame 6 when the final fc adjustment of the lens barrel is performed. An actuator (not shown) for auto focus is fixed to an outer peripheral portion of the fixed frame 8, and a fixed frame having a cam groove (not shown) cut at a front end thereof.

The flexible printed circuit board 9 includes a front electrical component mounting portion 9a, an extension portion 9b extended in the direction of the lens side mount 4 in parallel with an intermediate optical axis, and a connection portion 9c for a rear mounting contact. It is configured. Holding frame 13
Is adapted to hold the electrical component mounting portion 9a of the flexible printed circuit board 9, and fix the flexible printed circuit board 9 to the outer peripheral portion with an adhesive tape, and the holding frame 13 itself is fixed to the fixing frame by a screw (not shown). 6 fixed.

A mount contact block 10 for electrically connecting the interchangeable lens barrel to the camera body when the interchangeable lens barrel is mounted on the camera body is provided on the base end side of the flexible printed circuit board 9. Have been. The mount contact block 10 is constituted by integrally molding a plurality of metal mount contact pins 10a and a plastic holding member 10b. The mount contact block 10 is fixed to the lens-side mount 4 by screws (not shown).

Further, the front end of the mount contact pin 10a is located at the center of the optical axis of the interchangeable lens barrel.
A connection portion 10c of a rising contact piece that is bent by about 90 ° perpendicular to the optical axis direction is formed. The connecting part 10
c is the flexible printed circuit board 9 as described later.
To be connected.

FIG. 2 shows the mounting contact block 10 mounted on the flexible printed circuit board 9 of the mounting contact pin 10a.
FIG. 10 is a view as seen from the direction of a connection portion 10c.

As shown in FIG. 2, the connecting portions 10c of the mounting contact pins 10a of the first embodiment which are connected to the flexible printed circuit board 9 are characterized in that their directions are directed to the center of the optical axis.

FIG. 3 shows the flexible printed circuit board 9.
FIG. 4 is an enlarged perspective view showing the details of FIG.

Connection 9c with mount contact block 10
Extends from one end of the extension portion 9b in a substantially T-shape to form a partial cylindrical surface 9e centered on the optical axis. At positions corresponding to the connection portions 10c in the connection portions 9c, the same number of holes 9f as the number of mount contact pins 10a are provided in the connection portions 1c.
It is drilled at the same interval as 0c. Then, the connection unit 1
0c is disposed so as to be inserted into the corresponding hole 9f. Around the hole 9f, the conductive pattern exposed portion 9i to which the solder is attached at the time of soldering with the mount contact pin 10a.
Are formed to be exposed.

A notch 9g is formed at the boundary between the connecting portion 9c and the extending portion 9b, so that the partial cylindrical surface 9e is easily formed. Further, the extension 9
A portion 9b near the electrical component mounting portion 9a is formed with an S-shaped slack 9h. When the fc adjustment of the interchangeable lens barrel is performed, the position of the lens-side mount 4 changes depending on the thickness of the spacer 7. In this case, the moving amount is absorbed.

FIG. 4 is a perspective view of a main part showing a state where the mount contact block 10 and the flexible printed circuit board 9 are connected to each other. FIG. It is the expansion perspective view which expanded and showed the joint part with this.

As shown in FIGS. 4 and 5, the mount contact pin 10 is inserted into the hole 9f of the connecting portion 9c of the flexible printed circuit board 9 which is pulled out rearward of the lens in parallel with the optical axis.
The connection part 10c of a is inserted.

FIG. 6 is a sectional view showing an AA section after the mount contact pins 10a and the flexible printed circuit board 9 in FIG. 4 are fixed by soldering.

As shown in the figure, the mount contact pins 10a inserted into the holes 9f of the flexible printed circuit board 9 are provided.
Is electrically connected to and fixed to the conductive pattern exposed portion 9i by the solder 11.

As described above, in the first embodiment, the plurality of connecting portions 10c protrude toward the center of the optical axis, and the flexible printed circuit board 9 is pulled out in the direction of the mount contact block 10 in a state parallel to the optical axis. The connecting portion 10c is inserted into the hole 9f of the flexible printed circuit board 9 and is fixed by the solder 11 to conduct. Accordingly, the conductive pattern exposed portion 9i on the flexible printed circuit board used for soldering is also positioned in parallel with the optical axis, and the connection portion 10c does not protrude significantly toward the inner diameter side of the mount contact block 10, and As shown by 1, the rear lens group frame 2 can be brought close to the vicinity of the inner diameter side of the mount contact point 10. This is very effective for a telephoto lens or a large diameter lens having a large rear lens diameter.

Next, an interchangeable lens barrel according to a second embodiment of the present invention will be described with reference to the drawings.

In the second embodiment, the bending direction of the connecting portion 10c of the mount contact pin 10a and the shape of the connecting portion 9c of the flexible printed circuit board 9 connected to the connecting portion 10c are different from those of the first embodiment. ing.

FIG. 7 is an enlarged view of a main part showing a mount contact block in the interchangeable lens barrel according to the second embodiment.

As shown in this figure, the connection portion 12c of the mount contact pin 12a in the second embodiment, which corresponds to the connection portion 10c in the first embodiment, is connected to the connection portion 1c.
Similarly to Oc, it is bent about 90 ° toward the center of the optical axis, and is connected to the flexible printed circuit board 14.

Here, when the connecting portions 12c are given symbols a to i in order from the left in the figure, the connecting portions a and b are connected in the normal direction of the intermediate position between the connecting portions a and b. c and d are in the normal direction at an intermediate position between the connecting portions c and d, the connecting portions e, f, and g are in the normal direction at the position of the connecting portion f, and the connecting portions h and i are in the normal direction. They are oriented in the normal direction of the intermediate position between the connection parts h and i.

FIG. 8 shows a flexible printed circuit board 14 to which the connecting portion 12c of the mounting contact pin 12a is connected.
Extension 14b drawn out to the optical axis direction mount contact side
FIG. 10 is a perspective view showing a connecting portion 14c.

In the second embodiment, the connecting portion 14c of the flexible printed circuit board 14 is formed by a plurality of flat surfaces. Mount contact pin 1 on each plane
A hole 14f through which the connecting portion 12c of 2a is inserted is formed. Here, a ′ to i ′ are sequentially formed in the holes 14f as shown in FIG.
Mark. Holes a ′ and b ′ are formed in the plane 14j, and are bent with respect to the plane 14h so that the normal to the midpoint of the holes a ′ and b ′ is directed to the optical axis.

Holes c 'and d' are formed in the plane 14h, and the plane c is bent with respect to the plane 14l so that the normal to the midpoint of the holes c 'and d' faces the optical axis. . Plane 1
4l are provided with holes e ', f', g ', and holes f'.
Are arranged so that the normal passing through the optical axis is directed to the optical axis. Holes h 'and i' are formed in the plane 14m, and holes h 'and i'
It is bent with respect to the plane 141 so that the normal to the middle point of i 'is directed to the optical axis.

The connection portions ai of the connection portion 12c of the mount contact pin 12a are inserted into the holes a'-i ', respectively. A conductive pattern exposed portion 14i is formed around the holes a 'to i' in the same manner as in the first embodiment, so that the mount contact pins 12a and the flexible printed circuit board 14 are electrically connected by soldering. ing.

FIG. 9 is a perspective view of a main part showing a connection state between the mount contact block 12 and the flexible printed circuit board 14 in the second embodiment.

As shown in the figure, a plurality of planes 14j to 14
14m is bent and connected in accordance with the direction of the connection portion 12c of the mount contact pin 12a. From this state, soldering is performed to conduct and fix.

In the second embodiment, as in the first embodiment, the space up to the inner diameter of the mounting contact block can be used effectively, and the connecting portion 14c of the flexible printed board 14 is formed by a flat surface and a bending line. The configuration makes it easy to perform operations such as soldering.

In both the first embodiment and the second embodiment, the connection portion of the mount contact pin is located at 9 mm toward the center of the optical axis.
Although it is bent about 0 °, the optical axis may be bent about 90 ° vertically toward the outer peripheral surface in the opposite direction. In this case, the flexible printed circuit board is connected to the mount contact pins from the outer peripheral surface.

The shape of the connecting portion of the flexible printed circuit board is substantially T-shaped in both the first and second embodiments, but may be L-shaped or another shape.
Further, in the second embodiment, a forked shape as shown in FIG. 10 or a folded and overlapped shape as shown in FIG. 11 may be used.

The connecting portion of the flexible printed circuit board with the mounting contact pins formed four planes by bending. The number of these planes depends on the number of mounting contact pins and the number of mounting contact pins.
What is necessary is just to take the number of suitable planes according to an interval.

Furthermore, in both the first and second embodiments, the flexible printed circuit board and the mounting contact pins are fixed and conductive by soldering, but may be fixed and conductive by other methods.

In both the first embodiment and the second embodiment,
Although the connections at all the mounting contact pins are bent, it is not necessary to bend all the mounting contact pins. For example, only the mounting contact pins at both ends are bent toward the center of the optical axis by about 90 ° to position the flexible printed circuit board and the mounting contact block, and the other mounting contact pins are kept parallel to the optical axis. The exposed portion of the conductive pattern may be soldered.

As described above, according to each of the above embodiments, when the mount contact block and the flexible printed circuit board are connected, they protrude in the optical axis direction, and the tip is the center of the optical axis of the interchangeable lens barrel or the center of the optical axis. A mount contact pin bent by about 90 ° to the opposite side, and a flexible printed circuit board having a conductive pattern and a hole at the tip protruding from the inside of the lens barrel to the mount contact side in parallel with the optical axis and parallel to the optical axis. By connecting in the state, for example, a space for connection by soldering as shown in FIG. 16 can be positioned in the optical axis direction, and the inner diameter of the lens barrel in the direction perpendicular to the optical axis direction as in the conventional case. The connection portion does not protrude to the side, and the connection portion can be housed with a diameter equal to the inner diameter of the mount contact block.

As a result, even in a telephoto lens or a large-diameter lens having a large rear lens diameter, a space for the rear lens frame can be secured near the inner diameter of the mount contact block. Very effective in lens barrels. Also, of the plurality of mount contact pins protruding toward the lens side circuit in parallel with the optical axis,
By bending at least one mounting contact pin in a direction different from the optical axis and providing a hole for inserting the bent mounting contact pin in the flexible printed circuit board, reliable positioning of the mounting contact block and the flexible printed circuit board is ensured. It can be performed.

[0056]

As described above, according to the present invention, it is possible to provide an interchangeable lens barrel that is small and can be reliably positioned.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an interchangeable lens barrel showing a first embodiment of the present invention.

FIG. 2 is a view of the mounting contact block according to the first embodiment as viewed from a direction of a connection portion of the mounting contact pin with a flexible printed circuit board.

FIG. 3 is an enlarged perspective view showing the flexible printed circuit board in the first embodiment in more detail.

FIG. 4 is a perspective view of a main part showing a state where the mount contact block and the flexible printed circuit board in the first embodiment are connected.

FIG. 5 is an enlarged perspective view showing the joint portion between the flexible printed circuit board and the mounting contact block in the first embodiment further enlarged.

FIG. 6 is a sectional view showing an AA section after fixing the mount contact pins and the flexible printed circuit board in FIG. 4 with solder;

FIG. 7 is an enlarged view of a main part showing a mount contact block in an interchangeable lens barrel according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing an extension portion and a connection portion of the flexible printed circuit board to which the connection portion of the mount contact pin is connected to the mount contact side in the optical axis direction in the second embodiment.

FIG. 9 is an essential part perspective view showing a connection state between a mount contact block and a flexible printed circuit board in the second embodiment.

FIG. 10 is a perspective view showing a modification of the second embodiment.

FIG. 11 is a perspective view showing another modification of the second embodiment.

FIG. 12 is a cross sectional view showing a conventional one interchangeable lens barrel.

FIG. 13 is a transverse sectional view showing another conventional interchangeable lens barrel.

FIG. 14 is a sectional view of a main part of a conventional one interchangeable lens barrel.

FIG. 15 is an enlarged perspective view of a main part of the interchangeable lens barrel shown in FIG. 14 in further detail.

FIG. 16 is an explanatory view showing a general size of a pattern on a flexible printed circuit board side when soldering a mount contact pin and a flexible printed circuit board in the conventional technique shown in FIG. 12;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rear group lens 2 ... Rear group lens frame 3 ... Rear group drive frame 4 ... Lens side mount 5 ... Fixing screw 6 ... Fixing frame 7 ... Spacer 8 ... Fixing frame 9 ... Flexible printed circuit board 10 ... Mount contact block

Claims (1)

(57) [Claims] 1. A replacement lens which is detachable from a camera body.
In lens barrel, the lens barrel side mount is joined to the camera body side mount
It is provided at the end of the
A plurality of mounting contacts electrically connected to the camera body;
The holding member for holding the mounting contact is integrally formed.
Mount contact block and one end of the mount contact,
From the external shape of the mounted contact block
Connection formed without protruding to the lens barrel radial direction
And a mount contact disposed in the lens barrel
Of the flexible printed circuit board to have a <br/> conductive pattern exposed portions of electrically conducted by being fixed with the connecting portion, and the flexible printed circuit board and the mount contact
When connecting, expose the conductive pattern exposed part to the lens mirror.
Arrange in parallel with the optical axis of the cylinder, and
The conductive pattern above the outer diameter of the lock
Secured so that the exposed and secured parts do not protrude
An interchangeable lens barrel comprising: connecting means for connecting .