JPS614388A - Display device of video camera - Google Patents

Abstract

PURPOSE:To improve operability by displaying a color temperature indicating mark linked with a color temperature conversion switch in the field of finder of a video camera, and enabling to confirm the state of setting of the color temperature conversion switch in the visual field of the finder at all times. CONSTITUTION:Four light emission diodes for display 2 are incorporated in a visual field frame 1 and a film 3 on which four kinds of patterns 3a, 3b, 3c, 3d corresponding to the state of setting of a color temperature conversion switch S are printed so as to allow transmission of light of each light emission diode are superposed thereon. On the other hand, an interlocking two-circuit four-contacts rotary switch is used as the color temperature conversion switch S, and a switching circuit is used for switching of color temperature conversion and another switch is used for switching of lighting of four light emission diodes corresponding to each display mark. Thus, display corresponding to respective states of setting can be confirmed in the visual field of the finder interlocking with operation of the color temperature conversion switch S.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention performs p-tone conversion switching by switching a switch in order to adjust the white balance of a video camera, and changes the setting state. The present invention relates to a device for displaying information within the viewfinder field of a video camera.

[Prior art]

Depending on the light source illuminating the subject, the illuminated subject will have different tones. When using direct vision, one is not aware of it due to adaptation, but when the camera records it on film or videotape and plays it back as it is, the difference in the light sources illuminating the subject is strongly felt by the observer, resulting in an unpleasant image. becomes. Many video cameras are equipped with this adjustment device called white balance.

In a video camera, in order to automatically obtain the optimal color balance, the light reflected from a wide range of objects is separated by red and blue filters through a diffuser plate, each of which is received by a photodiode, and the color of the field light is determined. Obtain the temperature signal,
Some models are equipped with a white balance device that inputs this color temperature signal into a color correction circuit and corrects the color balance.Also, it is possible to adjust the color temperature in several levels such as incandescent light (tungsten light), fluorescent light, sunlight, etc. There is a white balance device in which a changeover switch corresponding to a temperature state is provided, and a photographer operates the changeover switch according to the light source to make adjustments.

In addition, in the above-mentioned white balance device, it is not necessary to insert a color temperature conversion filter into the photographing optical path only when sunlight is detected, since white balance using electrical processing is insufficient for sunlight. It's here. A white balance adjustment device is a device that inserts and withdraws a color temperature conversion filter into the photographing optical path under certain conditions along with such electrical switching, and white balance adjustment is performed by a combination of electrical switching and mechanical switching. ing. Therefore, depending on the condition of the light source illuminating the subject, electrical and mechanical
Some video cameras have multiple settings such as cloudy, fluorescent, and incandescent lighting.

In this way, in order to correspond to a wide shooting range from outdoor shooting to indoor shooting under sunlight, in order to always obtain the optimal color balance, the color temperature is adjusted to adjust the white balance depending on the type of illumination light of the subject. The switching operation of the conversion switch must be performed.

However, this color temperature conversion switch is generally installed in the external cabinet of the video camera, and the color temperature conversion switch must be set to correspond to the illumination light before looking into the viewfinder to take a picture. .

Normally, when shooting with a video camera, you continue to shoot while looking through the viewfinder, so when you continue shooting while moving from indoors to outdoors, you forget to take into account the changes in the lighting environment of the subject and use the color temperature conversion switch. There are drawbacks, such as the fact that there are many cases where people forget to switch the switch and continue shooting, resulting in video tube recording with poor color balance.

Also, even if you operate the switch, you cannot check the setting status of the color temperature conversion switch from the viewfinder field of view during shooting, and every time the illumination light, that is, the color temperature from the subject changes, you take your eyes off the viewfinder and the 'color This impairs the smoothness of photographing operations, as the temperature conversion switch must be operated and confirmed.

[Object of the Invention] The present invention provides a color temperature conversion switch as described above.
In order to eliminate operational defects, a color temperature display mark that is linked to the color temperature conversion switch is displayed within the viewfinder field of the video camera, allowing you to always check the setting status of the color temperature conversion switch within the viewfinder field of view, improving operability. The purpose is to provide a device that

[Structure of the Invention] The present invention relates to wide-ranging shooting from indoors to outdoors using a video camera, and in order to eliminate erroneous operation of the color temperature conversion switch, the color temperature is displayed in conjunction with the color temperature conversion switch for white balance adjustment. By displaying the display mark within the field of view of the finder, it is an object of the present invention to provide a video camera that achieves the object of the present invention and eliminates the above-mentioned drawbacks.

[Example J] Figure 1 shows an example of the optical system of a video camera equipped with a conventional color temperature conversion mechanism. Hereinafter, in each figure, the same structural parts are given the same reference numerals.

In the figure, there is a focus lens group FC that moves back and forth for focusing, a front group (1) and a rear group (2) following this, and a variable power lens group (2) that moves back and forth. Next, there is a front group lens M1 for imaging, and a splitting prism SP that divides the optical path into an imaging system and a finder system. 45
Split prism SP with a semi-transparent surface provided at an angle of °
A part of the light is bent at a right angle by the rear lens group M for imaging.

This forms an imaging optical system that forms an image on the light receiving surface of the image pickup tube T.

In addition, some of the light that has been split straight through the splitting prism SP is converted into a normal image when viewed from the finder E through the front group finder lens F1 and the pentalism Fs, and further converted to a right-angled image when viewed from the finder E. It constitutes a finder optical system that reaches the finder E through the seven finder lenses F in the rear group. A focusing glass F is mounted on top of the pendalism F, and a viewing frame 1 is mounted just above it. When viewed from finder B, this visual field frame l appears to indicate the photographing range.

In this embodiment, the color temperature conversion switch S uses four stages of switching: clear sky, cloudy weather, fluorescent light, and incandescent light, and each of these four setting states corresponds to the upper or lower side of the field of view frame when viewed from the viewfinder. Although the description will be made regarding the display using display marks, it goes without saying that the display may be displayed on any side of the viewing frame.

As shown in Figure 1'F2, four display light emitting diodes 2 are installed in the viewing frame 1, and four types of display mark patterns 3a, 3b, 3c corresponding to each setting state of the color temperature conversion switch S are placed thereon. , 3d is printed on the film 3 so that the light from each light emitting diode passes through.

Then, when viewed from the finder E, the light from each light emitting diode is optically masked and transmitted by the corresponding display mark pattern, and each pattern is visible within the field of view of the finder. The viewing frame 1 is attached to the finder optical system.

On the other hand, the color temperature conversion switch S uses an interlocking rotary switch with 2 circuits and 4 contacts, one switch circuit is used to change the color temperature conversion, and the other switch circuit corresponds to each display ゛-'. By using it to switch the lighting of the light emitting diode, it is possible to check the display corresponding to each setting state within the viewfinder field of view in conjunction with the operation of the color temperature conversion switch S. Regarding the diode, display mark 3
By using four light emitting diodes that emit light of different colors corresponding to a, 3b, 3c, and 3d, visual confirmation within the viewfinder field of view can be made more effective.

As other embodiments of the present invention, as shown in Fig. 3, Fig. 4, Fig. 5, and Fig. 7, a large display mark pattern can be seen at the position corresponding to each display mark of the above-mentioned visual field frame. Either make a hole 4 for letting in light, or make one side of the viewing frame out of a transparent material such as acrylic resin, and as above, make the display mark pattern 3a so that light can pass through.
3b, 3c.

A film 3 on which 3D has been burned is placed over this viewing frame so that light is transmitted in a pattern.

Or, as shown in Figure 4, directly place the display mark pattern holes 1a, lb at the position of the display mark on the viewing frame 1.
. It is also possible to open lc and ld so that light can pass through these patterned holes0.Then, the nook turns 3a, 3b of this display mark,
3c.

3d or la, lb, lc, and ld are illuminated within the above pattern according to the amount of peripheral light of the pentapris AF3, and this field frame 1 is set in the viewfinder optical system so that it can be clearly seen within the field of view when viewed from the finder E. It is attached to the top of the pentaprism F3 of the system.

On the other hand, this display mark 3a, 3b, 3c, 3d or la.

1b, lc, 1d (!:n).In order to indicate this, a pointer 6 is provided which slides parallel to the lateral direction of the viewing frame by a slide guide 5, and the pointer 6 moves in conjunction with the color temperature conversion slide S. Display marks 3a, 3b, 3c, 3d or la corresponding to each setting state
, lb, lc, and ld by operating the pointer 6 to indicate one of the following.

Also, a liquid crystal may be used for the pointer 9. That is, instead of the film 3 described above, a transmissive liquid crystal panel in which the display marks () are activated by electrical signals is installed so as to overlap the viewing frame 1 described above, and the color temperature conversion switch 2 is installed. This goal can also be achieved using circuit switches.

Next, as an extension of this embodiment, as shown in FIG.
A moving mask 8 having a window hole 7 such that only one of b, 3c, 3d or la, lb, 1c, ld can be seen from the finder is placed so as to overlap this viewing frame 1, and as described above, this moving mask 8 are mounted so as to slide in parallel in the horizontal direction by a guide 5, and in conjunction with the operation of the color temperature conversion switch S, the movable mask 8 slides in the horizontal direction, and the corresponding four display marks 3a, 3b are displayed.
, 3c, 3d or 1a, 1b.

The purpose can also be achieved by always viewing one of the marks lc and ld within the field of view of the finder through the window hole 8, and hiding the other three display marks from the field of view.

Next, an embodiment of the interlocking mechanism between the color temperature conversion switch S of the present invention and each display mechanism will be described.

Figure 7 is a perspective view of this mechanism.

In the figure, X-X indicates an optical axis for imaging, and the cam 9, lever, etc. are operated in conjunction with the 1C color temperature conversion switch S, and the color temperature conversion filter L is inserted and retracted. This color temperature conversion switch is a rotary switch, and on its axis C there is a cam 9 that also functions as a thread pulley (6D), and 4 (sunny, cloudy, fluorescent, and incandescent lights).
Two setting states can be selected using a combination of electrical and mechanical cam mechanisms.

The pointer 6 held on the slide 5 is connected to the transmission thread 1 from one end thereof.
0, the transmission thread 10 is connected to the guide rollers lla, l
lb, and the rotation axis C of the color temperature conversion switch S is 2~
Wrap it 3 times. This is to enable the yarn to be fed by friction when the shaft rotates. 0 is a tension spring 1 guided by guide rollers 11c and 11d.
Connect to 2.

Furthermore, the other end of the tension spring 12 is tied to the other end of the pointer 6 with a weft thread. The tension spring 12 is always in a state in which the thread is tensioned and in a state in which it is stretched so as to generate friction on the rotation axis C of the color temperature conversion switch S.

Now, when the color temperature conversion switch S is rotated counterclockwise and the switching operation is performed to the next setting state, the thread 10 is fed by the friction on the rotating shaft, and the thread is fed to the guide roller lla.

The pointer moves to the left after passing through 1 lb, I IC, and 11 d, and operates to indicate the next setting display mark in conjunction with the operation of the color temperature conversion switch.

In this way, the pointer 6 of the spear 5 figure or the window hole 7 of the spear 6 figure can be moved to display the display mark.

Note that these operations can also be performed using electric motors.

The viewing frame used in the present invention is made of a thin metal plate such as alumite or brass, or a thin plate made of resin such as acrylic, and the display mark can be made using the usual photographic method as described above.

[Effects of the Invention] According to the present invention, it is now possible to provide a video camera in which the setting state of the color temperature conversion switch can be visually confirmed within the field of view of the finder, and the operability of photographing is improved.

[Brief explanation of drawings]

Figure 1 shows the optical system of a video camera.
The figure shows a display using a light emitting diode as an example of the present invention, and Figure 3 shows a hole for lighting in a viewing frame and a film with a display mark burned into it. Figure 4 shows a display using a light emitting diode.
FIG. 3 is a diagram showing a cross-shaped hole of a display mark. spear 5
The figure is a diagram regarding indication by a pointer, and Figure 6 is a diagram regarding indication by a window hole. Figure 7 is a perspective view showing an example of a display mark switching mechanism that works in conjunction with the color temperature conversion switch of the present invention. 1... Field of view 7-m, 2... Light emitting diode, 3... Display mark, 3a, 3b, 3
c, 3d...display mark pattern, 6...
...Guidelines, 8...Moving mask, 10...
...Thread, S...Color temperature conversion switch.

Claims (1)

[Claims] It has a color temperature conversion switch that converts the color temperature of incident light, and means for displaying a color temperature display mark within the field of view of the viewfinder, and the setting state of the color temperature conversion switch is displayed by the display means in conjunction with the switch. A display device for a video camera, characterized in that the display device displays information within the viewfinder field of view.