JP2554082Y2 - Filter disk controller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a filter disk used in a television camera device.

[0002]

2. Description of the Related Art There are various types of optical filters used in television cameras according to the purpose of use, and the types of filters required differ depending on the use conditions. Therefore, the servo unit for controlling the filter disk must be configured accordingly.

The optical filter section of a conventional television camera has a configuration as shown in the block diagram of FIG. 2, and configures and controls a dedicated servo unit section corresponding to the number of filters mounted on the filter disk section. Therefore, when using a filter disk having a different number of filters to be mounted, a servo unit suitable for the filter disk must be mounted and used.

[0004]

[Problems to be solved by the invention] In the above-mentioned prior art,
When exchanging the filter disks having different numbers of filters with mechanical compatibility, there is a disadvantage that a servo unit specially designed for each filter unit is required. An object of the present invention is to eliminate these drawbacks and to realize a filter disk control device capable of performing a corresponding control even when filter disks having different numbers of filters are mounted.

[0005]

According to the present invention, in order to achieve the above object, a filter disc type discriminating signal generator is added to a filter disc section, and a filter disc stop position voltage in a servo unit is generated by the discrimination signal. The stop position voltage of each filter is automatically changed so that each filter can be stopped at the stop position corresponding to each filter disk.

[0006]

As a result, even if filter discs with different numbers of filters are mounted, the stop position voltage of each filter can be switched to a voltage suitable for each filter disc by the discrimination signal from the type discrimination signal generator. This makes it possible to use a filter disk portion having a different number of mounted filters in common with a servo unit.

[0007]

FIG. 1 shows an embodiment of the present invention. 1 is a filter disk, 2 is a filter disk 1
Is a filter position detector that detects the position of the filter and converts it to a corresponding voltage. Reference numeral 3 denotes a stop position voltage generator in which a stop position of each filter corresponding to each filter disk is set. A stop position voltage selector 4 selects a corresponding voltage from the stop position voltages of the respective filters from the stop position voltage generator 3 in order to select a desired filter in the filter disk 1 by a filter designation signal 9 from the outside. It is. Reference numeral 5 denotes a comparator for comparing the voltage from the filter position detector 2 with the voltage from the stop position voltage selector 4. Reference numeral 6 denotes an amplifier that amplifies the error signal from the comparator 5 to the power required by the filter driving unit 7. 10 is a filter disk 1
Is a filter type determination signal generator that generates a signal for determining the type of the filter.

Hereinafter, this operation will be described. The stop position voltage generator 3 generates a stop position voltage for each filter of the corresponding filter disk based on the filter type determination signal 11 determined by the filter type determination signal generator 10, and selects a stop position according to an external filter designating signal 9. The voltage at the stop position of the corresponding filter selected by the filter 4 and the voltage from the filter position detector 2 indicating the current filter position are compared by the comparator 5, and an error is detected by the amplifier 6 so that the two voltage values become equal. A signal is amplified, transmitted to the filter driving unit 7, and a loop for driving the filter disk 1 through the gear 8 is formed. The voltage value indicating the current filter position becomes equal to the voltage value from the stop position voltage selector 4. The filter disk 1 is controlled as described above.

[0009]

According to the present invention, it is possible to easily use various types of filter discs having different numbers of filters without the need for a dedicated filter servo unit. Filters suitable for outdoor, indoor or program contents can be used. Discs can be prepared and used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional example.

[Explanation of symbols]

1: filter disk, 2: filter position detector, 3:
Stop position voltage generator, 4: Stop position voltage selector, 5: Comparator, 7: Filter driver, 9: Filter designating signal, 1
0: Filter type discriminating signal generator

Claims (1)

(57) [Scope of request for utility model registration] 1. A type discriminating signal generating means corresponding to each of filter discs having a different number of filters mounted thereon is added, and when various filter discs having mechanical compatibility are mounted, the filter discs are automatically adapted to the respective filter discs. A filter disk control device comprising a filter servo means for generating and controlling a stop control voltage.