A lens tube
A lens barrel and lens group technology, which is applied in the directions of printing devices, instruments, focusing devices, etc., can solve the problems of high-precision positioning difficulties, complex manufacturing processes, high costs, etc.
Inactive Publication Date: 2009-03-04
OLYMPUS OPTICAL CO LTD
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Problems solved by technology
[0010] However, in the zoom lens barrel described in the above-mentioned Japanese Unexamined Patent Publication No. 11-64714, a stopper for preventing the base end from coming out of the thrust bearing hole is inserted into the thrust bearing hole formed on the outward flange at the front end of the third lens group frame. The zoom axis of the detached part, and thus the positioning of the first lens group frame and the third lens group frame, but it is very difficult to perform high-precision positioning
Furthermore, since the space for the thrust bearing hole and the like, the length of the zoom shaft, etc. are required structurally, it is difficult to further shorten the length of the zoom lens barrel when the lens is retracted, and, considering the manufacturing process, the molding of the thrust bearing hole and the zoom Mounting work such as connecting the shaft is also necessary, which causes a very complicated manufacturing process, resulting in a problem of high cost
Method used
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Embodiment Construction
[0046] Embodiments of the present invention will be described below with reference to the drawings.
[0047] Fig. 1 shows the first embodiment of zoom lens barrel of the present invention to Fig. 5, Fig. 1 is the exploded perspective view of this zoom lens barrel, Fig. 2 illustrates the structure when this zoom lens barrel zooms, Fig. 2 (a ) is the retracted state of the lens of the zoom lens barrel, Fig. 2 (b) is the wide-angle state of the zoom lens barrel, and Fig. 2 (c) is the telescopic state of the zoom lens barrel. image 3 It is an expanded view of the inner peripheral surface of the cam frame of Fig. 1, Figure 4 For explaining the sending action explanatory figure of the zoom lens barrel of Fig. 1, Fig. 5 is the structural diagram illustrating the main characteristic part structure of the zoom lens barrel of the present embodiment, Fig. 5 (a) is the 1st lens group frame and the 3rd The perspective view of the enlarged structure of the lens group frame, Fig. 5(b) is a...
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The present invention provides a lens barrel capable of accurately performing positioning between a 1st lens group frame and a 3rd lens group frame with simple constitution, the simplification of a manufacturing process and the reduction of manufacture cost. A rotating frame 3 is rotated by the rotational driving of a driving gear 100 in a fixed frame 2 in this lens barrel 1, the rotating frame 3 and a moving frame 4 are relatively extended and a cam frame 5 is also extended by the cam groove 4m of the moving frame 4. Then, the 1st to the 3rd lens group frames 6 to 9 are relatively extended according as the cam frame 5 is extended. In the case of zooming operation from a wide end position to a telephoto end position, a 1st group pin 13 for extending the 1st lens group frame 6 abuts on the positioning part 14b of a 1st group sliding groove 14a formed on the extended part 14 of the 3rd lens group frame 9 by the energizing force of a spring 8, whereby the 3rd lens group frame 9 is positioned at a specified interval with respect to the 1st lens group frame 6 and integrally extended in a state it keeps the specified interval.
Description
technical field [0001] The present invention relates to a lens barrel capable of moving a camera and the like along an optical axis direction of a plurality of mirror frames holding a photographic lens group and the like. Background technique [0002] In recent years, in popular portable zoom cameras, the zoom lens barrel must move forward and backward within the shooting range from the wide-angle state to the telephoto state. Furthermore, in order to become a compact state when carried, there is provided a practical zoom lens barrel that can be moved to a so-called retracted state, which means that the zoom lens barrel can be moved from a wide-angle state to a telephoto state. The so-called photography state is housed in the camera body. In particular, in order to increase the zoom magnification in recent years, the difference between the lens barrel length in the wide-angle state or the lens retracted state and the lens barrel length in the telephoto state has been furthe...
Claims
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IPC IPC(8): G03B13/32G02B7/04G02B7/10G02B7/02G02B7/08G03B5/00
CPCG02B7/102
Inventor 安富暁
Owner OLYMPUS OPTICAL CO LTD