JPH0490529A - Focal distance switching device for camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a camera focal length switching device that enables multifocal photography by inserting and removing a converter lens for focal length switching into and out of the photographing optical path. It is something.

[Prior art] Conventionally, for example, a three-focal camera is usually
As described in 25, etc., three focal lengths can be switched by using a drive motor to move the master lens barrel back and forth and stopping it at a short focal length position, a medium focal length position, and a long focal length position. I am doing it.

However, the above-mentioned conventional devices had drawbacks such as (1) requiring a complicated interlocking mechanism and adjustment for moving the master lens, (2) increasing weight due to increased number of parts, and (3) increasing cost.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and includes first and second photographing optics that switch the focal length by rotating around an axis along the photographing optical path and moving in and out of the photographing optical path. and a switching means that rotates around an axis perpendicular to the above-mentioned axis and drives the first and second photographing optical systems in and out of the photographing optical path, and allows focal length switching with a simple configuration. It is an object of the present invention to provide a focal length switching device.

[Example code] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a perspective view of the internal structure of a camera according to an embodiment of the present invention, viewed from the upper right, where ] is a master lens for photographing, 2 is a lens barrel for a wide converter having a pressing part for switching, and 3
4 is a wide lens as a first photographing optical system; 5 is a macro lens as a second photographing optical system; and 6 is a focal point switching means with a shaft portion. Lever 7.8 is a retaining ring for preventing the lens barrel from slipping out; 9 is a shaft portion for attaching the lens barrel with an insertion portion for the retaining rings 7 and 8; 10 is a master lens 1 for photographing, the shaft portion 9 and , a unit main body in which aperture mechanisms for exposure are integrated into one; 11 is a bearing for a switching lever attached to the unit main body 10;

FIG. 2(A) is a top view of the configuration of FIG. 1, and FIG. 2(B) is a front view of the same, showing a normal (Wide) photographing state. 13 is a horizontal part (H) of the lens barrel 2, 14 is a pressing part (V), and the lens barrel 3 is also given the same name.

Next, the operation of the above configuration will be explained with reference to FIGS. 3 to 5.

3 to 5 are normal (Wide)
Indicates shooting status, Te1e shooting status, macro shooting status,
Further, (A) to (C) of each figure show a top view and a cross-sectional view of the front view aa in each mode when the bearing 11 is removed.

Furthermore, FIG. 6 is an external perspective view showing the external appearance of a camera to which this configuration is applied. Note that 16 in Figure 6 is the lever 6 in Figure 1.
Line knob for switching each shooting mode attached to the
17 is a seven-nose firefly.

In FIG. 6, when the switching knob 16 is turned in the N direction, the interior enters the normal (wide) photographing state shown in FIG. 3, and the lens barrel 2 is set on the photographing optical path.

Next, when the switching knob 16 is switched in the T direction, the switching lever 6 is internally rotated by the knob 16. This switching lever 6 moves with its lower surface in contact with the H surface of the lens barrel 3. At the same time, the left side presses the H surface of the lens barrel 2. Therefore, only the lens barrel rotates counterclockwise and retreats from the photographing optical path, resulting in the state shown in FIG. 4. At this time, if you set the focal length of the photographing lens 1 to the Tel side in advance, this will become the Tel side.
It becomes e-shooting mode.

Further, when the switching knob 16 is set in the M direction, the right side surface of the switching lever 6 pushes against the 7th surface of the lens barrel 3 inside. Therefore, the lens barrel 3 is set in the photographing optical path.

In addition, since the lens barrel 2 moves on its H surface with the switching lever 6 touching its lower surface, it remains retracted, and in this mode it becomes as shown in Figure 5, and is set to the macro shooting state. .

As explained above, according to the configuration of this embodiment, two lens barrels that rotate around a single axis along the photographing optical path are provided, and these lens barrels are sequentially moved in and out of the photographing optical path. As a means to change the focal length, a differential lever is used that rotates around an axis perpendicular to the above-mentioned axis, and the movement of the switching knob protruding from the exterior surface is directly controlled by the rotation of the lens barrel. Since the configuration is such that the focal length can be changed by using the Very effective for cameras, etc.

Further, the switching lever 6 of the above embodiment may be driven by a motor, a plunger, or the like. In this case as well, it is possible to obtain a compact three-focal camera with a simple structure and low manufacturing cost.

Further, in the above embodiment, the lens barrel on one side can be changed to a lens barrier.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a camera focal length switching device that can switch the focal length with a very simple configuration, and its effectiveness is extremely high.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the internal configuration of a camera according to an embodiment of the present invention. FIGS. 2(A) and (B) are a top view and a front view of the configuration of FIG. 1. FIG. 3(A) , (B) and (C) are top views of the wide shooting state showing the operation of the configuration in Figure 1, respectively, and Figures 4 (A), (B), and (C) are top views of the configuration in Figure 1 respectively Front view of Te1e photographing state showing the operation of
) and (C) are sectional views taken along the line aa in a macro photography state showing the operation of the configuration shown in FIG. 1, respectively, and FIG. 6 is an external perspective view of a camera to which the configuration shown in FIG. 1 is applied. ■Master lens for photography 2 Lens barrel for wide converter lens 3 Lens barrel for macro converter lens 4, Wide lens 5, Macro lens 6, Switching lever 9, Lens barrel mounting shaft 10, Unit body 16, Switching knob 17 Release button

Claims (1)

[Claims] first and second photographing optical systems that rotate around an axis along the imaging optical path and switch focal lengths by moving in and out of the imaging optical path; A focal length switching device for a camera, comprising switching means for driving a second imaging optical system into and out of the imaging optical path.