JPS58111578A - Magnetic video recorder incorporated with camera - Google Patents

Abstract

PURPOSE:To display the state of usage of a video tape a photographer with a simple mechanism, by providing a projecting means illuminating the outer circumference of winding of a video tape and leading the image of outer circumference of winding with this projection to an optical finder system. CONSTITUTION:An image picked up luminous flux 5 from an objective is plit with a beam splitter 3 of an image pickup optical system, the transmitted luminous flux is formed on a pickup element 6 via a relay lens 4, and the reflected luminous flux is observed by a photographer via relay lenses 7, 8, a mirror 9 and an eyepiece lens 10. The projecting means consisting of a light source 20 provided at the right side of a video tape cassette 11 and a light diffusion prism 22 forms the image of the winding outer circumferences (a), (b) of video tapes 12A, 12B and their clearances 15 on the same plane as the primary image forming plane of the optical finder system so as not to be overlapped with the image of the objective, allowing to display the usage state of the video tape for the photographer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera-integrated magnetic recording device that integrates a magnetic recording device and a video camera.

Compared to the conventional method of recording television images using the magnetic recording device of a mirror device, when taking silver pictures using the camera-integrated II magnetic sickle image device, which is easy to carry, the range of action for mother jI photography can be expanded. However, there are problems in that people take pictures without knowing the amount of video tape to be used or the amount remaining, and they miss out on great opportunities to take pictures due to a shortage of video tape, or are unable to take scheduled pictures. In addition, there is a method of detecting changes in the rotational speed of a tape reel due to the amount of tape used, and reading the changes to calculate and display the amount of remaining tape. This has the drawback that a calculation means is required and the mechanism becomes complicated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and drawbacks, and to provide a camera-integrated magnetic recording device that can display the usage status of a videotape to a photographer using a simple mechanism.

In order to achieve this object, the present invention includes a light projecting means for illuminating the outer circumferential end of the videotape, and an imaging optical system that guides the outer circumferential end of the winding by the light projecting means to an optical finder system. It is characterized by:

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a sectional view showing an embodiment of a camera-integrated magnetic recording device according to the present invention, and parts not related to the present invention are omitted.

An imaging lens system 2, a beam splitter 3, and a relay lens 4 are provided in a portion of the camera-integrated magnetic recording device 1 facing the subject, forming an imaging optical system in this embodiment. The imaging light flux (arrow) 5 from the subject is split by the beam splitter 3 of the imaging optical system, the transmitted light flux is imaged on the image sensor 6 via the relay lens 4, and the reflected light flux is focused on the relay lens 7.8 and the mirror. 9 guides the eyepiece lens lOK and is observed by the photographer. Relay lens 7.
8, mirror 9 and eyepiece lO form an optical finder system. According to the photographer's intention, the video tape 12 of the video tape cassette 11 is recorded by a recording mechanism (not shown) built into the camera-integrated magnetic recording device 1. Tape section 12 before recording wound on reel 13
The winding outer peripheral end a of A and the wound f of reel 14&C
A mirror 16 forming an angle of 45 degrees is provided on the surface of the videotape cassette 11 in a gap 15Kaj formed between the ends of the wound outer periphery of the finished tape portion 12B, and a mirror 16, 17, and a relay lens. 18, mirror 19, and eyepiece lOK form the imaging optical system in this embodiment.

FIG. 2 is a sectional view of the embodiment shown in FIG. 1, viewed from the rear. A lamp 20 is provided on the right side of the videotape cassette 11, and the lamp 20 and the light diffusion prism 22 having the diffusion surface 21 form the light projecting means in this embodiment. On the left side of the videotape cassette 11, on the mirror 16 of the imaging optics, the light from the lamp 20 and the light-diffusing prism 22 is exposed to a side transparent part 23, 24, which is indicated by point IIK on the videotape cassette 11, and a tape part 12A. , 12B, and the winding outer circumferential ends a, b of the tape portions 12A, 12B and the gap 15 have the same surface area as the primary imaging plane of the optical finder system, and The image of the object on the primary imaging plane is imaged so as not to be electrified, and is observed by the photographer through the eyepiece lens 10.

FIG. 3 shows the field of view observed by the photographer through the eyepiece lens 1o. Tape portions 12A and 12B projected by the light projecting means and an image 25 of mis between them.
is guided to the peripheral part 27 of a field of view 260 by the imaging optical system shown in FIG. 1.2, and is imaged outside the range 28 in which the subject is imaged by the imaging optical system.

In the embodiment shown in FIGS. 1 to 3, as recording progresses and the video tape 12 is used by a magnetic imaging device (not shown) K, the rotation radius of the tape portion 12A on the front side of recording decreases, and the recording The radius of rotation of the tape portion 12B on the finished side increases, and the outer circumferential ends a of the tape portions 12A, 12B are
The gap 15 between b is from the reel 13 side to the reel 14@*
1111 Sur. The increase/decrease in the radial length of the f-7 portions 12A, 12B and the movement 6115 between the ramps 20
By the illumination of the light diffusing prism 22, the light passes through the side transparent parts 23 and 24 of the videotape cassette 11.
mirror 17, relay lens 18, mirror 1
9 and an eyepiece lens 10, the image is formed on the photographer's eye.

This allows the photographer to know the remaining amount of the videotape 12 and to confirm the state in which the videotape 12 is moving.

The light projecting means according to the embodiment of the present invention does not use the run 220 and the light diffusing prism 22, but instead uses the videotape cassette 1 which receives light from the outside and has a reflective member on the lateral transparent portion 23 side.
1 may be used, or both of the above may be used in combination. Alternatively, the light diffusing prism 22 may be omitted, and light may be emitted directly by a two-amplifier 20 made of light diffusing glass, or a light diffusing means may be installed on the transparent section 23 on the side of the video tape cassette 110. You may. Note that the mechanism of the imaging optical system described in this embodiment is not limited thereto.

As explained above, according to the present invention, a light projecting means for illuminating the outer circumferential end of the winding of the video chip 1, and an imaging optical system that guides an image of the outer circumferential end of the winding by the light projecting means to an optical finder system are provided. Since the outer circumferential end of the videotape can be seen through the optical finder system, the usage status of the videotape can be accurately displayed with a simple mechanism.

[Brief explanation of drawings]

Figure 1.2 is a sectional view showing an embodiment according to Honjitsu@, and Figure 3.
The figure is a diagram showing the field of view of an eyepiece lens of an optical finder system according to an embodiment of the present invention. 1...Camera integrated magnetic silver image device, 7.8...Relay lens, 9...Mi5-110...Eyepiece lens, 1
2...Video tape, 13.14...Reel, 16
．． 17... Kutsu, 18... Relay lens, 19#
- ζ two, 20... Lamp, 22... Light diffusing prism, 25... Image of the tape portions 12A, 12B and the gap 15 between them, a, b... Winding outer peripheral end. Patent applicant: Canon Co., Ltd. Agent Minoru Nakamura

Claims (1)

[Claims] t In a device that integrates a magnetic recording device and a camera and is equipped with an optical finder system, a light projecting means for illuminating the outer circumferential edge of the videotape, and an optical finder system that illuminates the outer circumferential edge of the winding by the light projecting means. What is claimed is: 1. A camera-integrated M magnetic recording device, characterized in that it is provided with an imaging optical system that guides