JP3303456B2 - Fixed cylinder mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed barrel mounting structure for mounting a fixed barrel holding a lens barrel unit including a plurality of lens barrels to a camera body.

[0002]

2. Description of the Related Art FIG. 2 is a longitudinal sectional plan view of a camera body showing a conventional fixed cylinder mounting structure. In FIG. 2, reference numeral 1 denotes a fixed cylinder, and 2 denotes a rotating ring fitted to the outside of the fixed cylinder 1. . 3 is a first lens barrel, 4 is a second lens barrel, 5
Denotes a third lens barrel, each of which has a first lens group 3
a, the second lens group 4a, and the third lens group 5a.

The fixed cylinder 1 has a rectilinear groove 1a, and the rotary ring 2 has cam grooves 2a, 2b, 2c, which constitute a well-known zoom lens driving mechanism. The fixed barrel 1 holds the entire barrel unit composed of the lens barrels 3 to 5, and the fixed barrel 1 is attached to the camera body 6 so that the lens barrels 3, 4, and 5 are attached to the camera body. Will be. The fixed barrel 1 is attached to the camera body 6 by screwing the flange 1b of the fixed barrel 1 to the bottom surface of the concave portion 6-3 of the camera body 6 formed between the film cartridge chamber 6-1 and the spool chamber 6-2. Stopping, etc.

However, recently, a so-called panoramic switching type camera has been developed, and a panoramic light-shielding vane is stored in the bottom surface of the lens barrel housing concave portion of the camera body. Had to avoid the blades, which was against the downsizing of the camera.

As a countermeasure, the flange portion 1 of the fixed cylinder 1
b to form a folded extension 1c outside the fixed cylinder, leaving a gap for the rotary ring 2 to enter. The extension 1c is bent outward at a right angle to form a mounting seat 1d. A screw is attached to the film cartridge chamber 6-1 of the camera body 6 or the excess front surface of the spool chamber 6-2.

[0006]

However, in the above conventional example, when an external force is applied by a zoom drive or the like, the extension of the fixed barrel is bent and the entire photographing optical system is tilted. However, when the outer slide type is provided in the cylindrical portion of the fixed cylinder, there is a problem that the outer slide type cannot be provided in a range where the extension 1c exists.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fixing cylinder mounting structure which solves the above problems.

[0008]

According to the present invention, there is provided a camera body having a lens barrel storage recess between a spool chamber and a film cartridge chamber, and a lens barrel unit which is held at the end and fitted into the lens barrel storage recess. A fixed cylinder having a flange portion that fits, a rotating ring rotatably fitted to the outside of the fixed cylinder, and an extension fixed to the camera body and extending between a side surface of the lens barrel housing recess and the rotating ring. A holding member having a portion for pressing the flange portion at the end face of the extension portion to fix the fixed barrel to the camera body; a fixed barrel mounted on the flange portion of the fixed barrel and a bottom surface of the lens barrel housing recess; The fixed cylinder does not tilt with respect to the camera body even when an external force is applied, and the outer slide type is freely provided outside the fixed cylinder. Can be.

[0009]

FIG. 1 shows an embodiment of the present invention. The same parts as those in FIG. The fixed cylinder 1 has a flange portion 1b on the mounting end surface, and the flange portion 1b and the concave portion 6 of the camera body 6 to which the flange is attached.
-3 for positioning relative to the bottom surface of -3
Are formed.

Reference numeral 9 denotes a holding member. The holding member 9 has a rear end flange 9a.
In a state in which the flange portion 1b of the fixed cylinder 1 is pressed against the camera body 6 with its tip (extended portion end face) 9c.
The rear end flange portion 9a is screwed to the film cartridge room 6-1 of the camera body 6 or the excess front surface of the spool room 6-2. In other words, by fixing the holding member 9 to the camera body 6 with screws, the fixed barrel 1 is sandwiched and fixed between the camera body 6 and the fixing barrel 1.

At this time, the length of the extension portion 9b of the holding member 9 is adjusted from the screwing surface of the camera body 6 to the flange portion 1 of the fixed cylinder 1.
By making the length slightly longer than the length L up to b, the fixing cylinder 1 can be firmly fixed to the camera body 6 when the holding member 9 is screwed to the camera body 6.

[0012]

As described above, according to the present invention,
The fixed barrel holding the lens barrel unit is positioned on the bottom of the recess of the camera body, and the tip of the holding barrel having an extension extending between the rotating ring fitted on the outer periphery thereof and the side face of the recess of the camera body is used to fix the fixed barrel. Since the flange portion is pressed against the bottom of the concave portion and the rear end flange portion of the holding member is screwed to the front surface excess portion of the camera body, the fixed barrel holding the lens barrel unit is inclined even when subjected to external force. And can be securely fixed to the camera body. Also, due to the molding of the fixed cylinder alone,
The effect that the outer slide type can be set arbitrarily can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a mounting structure of a fixed cylinder according to an embodiment of the present invention.

FIG. 2 is a diagram of a conventional fixed cylinder mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed cylinder 1b Flange part 2 Rotating ring 6 Camera body 6-1 Film patrone room 6-2 Spool room 6-3 Lens tube storing recess 9 Holding member

Claims (1)

(57) [Claims] 1. A camera body having a lens barrel storage recess between a film cartridge chamber and a spool chamber, a fixed barrel holding a lens barrel unit and having a flange at one end having a flange fitted into the lens barrel storage recess; A rotating ring rotatably fitted to the outer side of the fixed barrel, and an extension extending from a side surface of the lens barrel housing recess to the rotating ring with a rear end flange fixed to the camera body. A pressing member that presses the flange portion with the end face of the extension portion to fix the fixed barrel to the camera body, and a fixing member fixed to the flange portion of the fixed barrel and the bottom surface of the lens barrel housing recess.
Concavo-convex engagement part for positioning and fixing the fixed cylinder to the camera body
And a mounting structure for the fixed cylinder.