JPS622593Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oscilloscope camera that can change the magnification when photographing a waveform displayed on a cathode ray tube of an oscilloscope.

[Conventional technology and its problems]

Oscilloscope cathode ray tube screens have different sizes, for example 8 x 10 cm or 4 x 5 inches, so if the screen size is different when taking a photo, the size of the waveform recorded on the film will change. Put it away. In order to expose a film to a waveform of a constant size regardless of the screen size, the magnification must be changed appropriately. That is, when photographing a waveform on a large screen, the magnification must be small, and when photographing a waveform on a small screen, the magnification must be increased.

In conventional oscilloscope cameras, the optical means is continuously moved in the axial direction of the lens within the frame member to continuously change the magnification. However, such conventional cameras have the disadvantage that they are complicated and expensive, and that it is difficult to adjust the magnification to a constant magnification while maintaining a focused state.

Another oscilloscope camera disclosed in Japanese Patent Application Laid-Open No. 48-52224 has a lens mounting plate that is housed in a cylinder with a Polaroid type camera attached to the rear so as to be slidable back and forth, and is moved forward using a spring. The lens is positioned offset by attaching caps with different structures for different magnifications to the front and rear openings of the cylindrical body, and the magnification is changed to a predetermined value. However, this prior art has a complicated structure and requires different caps to be prepared for different magnifications, resulting in high costs and problems with storage, such as loss or damage of replacement parts.

Furthermore, Japanese Utility Model Publication No. 47-38166 discloses that in order to photograph oscillographic images on the same screen with different magnifications on films of different sizes, different film holders are prepared for films of different sizes, and An oscillographic imaging device is disclosed in which the holder can be replaced and the direction of assembly of a lens case with a lens attached to one end can be reversed. This conventional device cannot be used for photographing images on screens of different sizes onto a film of the same size at different magnifications. Moreover, since it is necessary to replace the film holder for each magnification, this method has the same drawbacks as the conventional example described above, which is associated with replacement parts.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to overcome the above-mentioned drawbacks of the prior art and to provide an oscilloscope camera that can be switched to a plurality of fixed magnifications with a simple configuration and without the need for any replacement parts. be.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. The figure is a plan sectional view showing a preferred embodiment of the present invention. The camera includes, for example, a film door 10, a Polaroid (registered trademark) film storage section 12, a frame member 14, a mounting member 16, a spacer 4, a hood member 18, and an optical means, that is, a lens-shutter device 20. Film storage section 1
2 holds a pack or roll of photographic film, and the film is loaded and unloaded by opening the film door 10. The optical means 20 is attached to the mounting member 16 by means of a ring 17.
installed in the center opening of the Mounting member 16 houses a battery 22 that powers a light source (not shown). The shutter button 24 is connected to the optical means 20 through a side hole of the mounting member 16. Mounting member 16
is removably attached to the frame member 14 by fitting or using screws or the like. Furthermore, spacer 4 for magnification switching
is attached to the mounting member 16, and the hood member 18 is attached to the spacer 4.
They can be fitted or removably attached with screws, etc., respectively. The front open end of the hood member 18 is adapted to be attached to the front surface of the cathode ray tube screen of the oscilloscope by coupling means (not shown).

When the mounting member 16 and the spacer 4 are attached in the order shown in the figure, the waveform on the screen is exposed to the film at a predetermined small magnification. At this time, the relationships among the distance from the screen to the optical means 20, the distance from the optical means 20 to the film, and the focal length of the optical means 20 are appropriately set in advance, so that the waveform on the screen is focused on the film.

When photographing waveforms from an oscilloscope with a small screen using the oscilloscope camera of the present invention, the mounting member 16 and spacer 4 are replaced.
That is, the frame member 14, the spacer 4, the mounting member 16, and the hood member 18 are attached in this order from the film storage section 12. In this case, the waveforms on the screen are exposed to the film at a greater magnification than if they were mounted in the order shown. Although the distance from the screen to the optical means and the distance from the optical means to the film are reversed from those shown in the figure,
There is no need to adjust the focus at all. Since the distance from the screen to the film is the same as shown in the figure, even if the optical means is moved slightly near the middle between the film and the screen, the focal point will be at almost the same position as in the case of the figure, which is not practical. No problem. Furthermore, since the magnification is determined by the relationship between the distance from the screen to the optical means 20 and the distance from the optical means 20 to the film, each magnification can be fixed at a desired value.

Although the above explanation has been made only regarding the preferred embodiments of the present invention, it is natural that various changes and modifications can be made without departing from the gist of the present invention as stated in the claims for utility model registration. It will be obvious to business owners.

[Effect of idea]

As explained above, according to the present invention, the front opening end of the hood member is made to correspond to the largest of a specific number of screens of different sizes, and the distance from the screen to the film is kept constant by changing the mounting position of the spacer. Since the optical means is moved substantially in focus near the middle between the screen and the film while maintaining the same camera, the same size film can be used with the same camera for oscilloscopes with different size screens. You can take pictures using it. Further, since no replacement parts are required for changing the magnification, storage problems such as loss or damage of replacement parts are also eliminated. Furthermore, since the structure is extremely simple, manufacturing costs are low.

[Brief explanation of the drawing]

The figure is a plan sectional view showing a preferred embodiment of the present invention. 4... Spacer, 12... Film storage section, 1
4...Frame member, 16...Mounting member, 18...
...Hood member, 20...Optical means.

Claims (1)

[Scope of Claim for Utility Model Registration] An oscilloscope camera that uses the same size film to photograph waveforms displayed on a specified number of cathode ray tube screens of different sizes on an oscilloscope, which has open ends at the front and rear. a hood member whose front opening end has a size corresponding to the largest of the specified number of screens of different sizes; a frame member having a front opening end and a film storage section at its rear; an optical means is attached to the central opening, and a mounting member that can be attached between the rear opening end of the hood member and the front opening end of the frame member; a spacer inserted between the member and the mounting member or between the mounting member and the frame member, and maintaining a constant distance from the screen to the film by changing the mounting position of the spacer. the optical means is moved in a substantially focused state near the middle between the screen and the film, and the magnification of the image formed on the film is set to two predetermined magnifications depending on the size of the screen. An oscilloscope camera that can be set to either one of these.