JP2005173122A - Filter disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To disuse additives such as glass fibers harmful to frictional slide while preventing ghost light. <P>SOLUTION: A rugged shape is given to a straight surface for receiving a filter, of a filter disk. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a filter disk.

  Conventionally, in a photographing system such as a color TV camera, a filter disk containing various filters such as a color temperature conversion filter used for photographing is provided in one or a plurality of filter disk devices, and the filter disk device is photographed It is placed in a part of the system. Then, a filter suitable for the shooting conditions is appropriately selected manually or electrically from the filter disk and mounted on the shooting system, thereby optimizing the shooting conditions.

  Regarding filter disk devices, various types of devices have been proposed, including the filter disk of Patent Document 1.

  7 to 9 are drawings showing a conventional filter disk, 7 is a main body for holding the filter disk, 8 is a knob gear, 9 is an idler gear, 10 is a filter disk, 11a to 11d are various filters, and 12 is a click leaf spring. , 13 is a rotating roller, and 14 is a shaft that supports the 13 rotating rollers. The shaft is fixed to the 12 click leaf springs by caulking or the like, and the 13 rotating rollers are positioned between the 14 shafts so as to rotate smoothly. Therefore, 12, 13 and 14 are unitized as a single part.

  In this figure, when a knob (not shown) fixed to the knob knob 8 is rotated manually or electrically, the filter disk is rotated by being transmitted to the gear 9 and the filter disk 10. When the desired filter comes to the optical axis O, the 13 rotating rollers that have rotated the outer periphery of the filter disk fall into the click groove provided on the outer periphery of the filter disk 10a by the force of 12 leaf springs and are positioned.

  In general, the above-described conventional example is obtained by molding an engineering plastic material as a material of a filter disk, and a part of the filter is cut into a D shape to reduce the size of the apparatus.

  10c for receiving the eleventh filter in the filter disk has a straight shape and prevents a state (ghost light) in which the effective light entering from the photographing lens is abnormally shined after entering the end face and enters the effective light beam. In order to prevent this, glass fiber is mixed to prevent reflection as a rough matte surface.

When glass fiber or the like is not mixed, a mask part is provided separately so that ghost light does not fall within the effective range.
Japanese Unexamined Patent Publication No. 08-125927

  However, since this glass fiber or the like has an adverse effect on the sliding durability of the positioning click of the filter disk, it is necessary to form a rotating roller for performing rolling friction on the tip of the click spring. In order to configure this rotary roller, it is necessary to set shaft parts to be supported and highly accurate dimensions for obtaining smooth rotation, which increases the number of parts and causes an increase in cost.

  Further, when glass fiber or the like is not mixed, since mask parts are provided separately, the number of parts increases, resulting in an increase in cost.

  In order to achieve the above object, in the invention according to the present application, the shape of the straight surface that receives the filter in the filter disk is not a flat surface but a uniform or non-uniform uneven shape.

  As described above, according to the invention related to the present application, the shape of the straight surface that receives the filter in the filter disk is made uneven so that glass fibers and the like harmful to frictional sliding can be prevented while preventing ghost light. Since the additive can be eliminated, the positioning click mechanism can be configured with the leaf spring as it is and brought into frictional contact.

(First embodiment)
1 to 4 show the features of the present invention most, and show a configuration of a three-block type color separation prism used in a television camera or the like. In the figure, 1 is a photographing lens, 2 is a television camera, 3 is a mount, 4 is a filter disk section, 5 is an image sensor such as a CCD, 5 is a color separation prism 6a, 6b and 6c, 7 is a main body for holding a filter disk, 8 Is a knob gear, 9 is an idler gear, 10 is a filter disk, 11a to 11d are various filters, and 12 is a click leaf spring.

  In this figure, when a knob (not shown) fixed to the knob knob 8 is rotated manually or electrically, the filter disk is rotated by being transmitted to the gear 9 and the filter disk 10. When the desired filter comes to the optical axis O, 12 click leaf springs fall into the click groove provided on the outer periphery of the filter disk 10a and are positioned. At this time, the twelve click leaf springs are frictionally slid on the outer periphery of the ten filter disks.

  In the above configuration, as shown in FIGS. 3 and 4, the filter disk 10b1 has an uneven shape. In this embodiment, the unevenness is a uniform shape.

(Second embodiment)
FIG. 5 is a drawing showing the second embodiment, which is the same as the first embodiment except that the uneven shape of FIG. 4 is a shape with non-uniform dimensions in the left-right direction. If the uneven shape is uniform, a diffraction phenomenon may occur, which is prevented in this embodiment.

(Third embodiment)
FIG. 6 is a drawing showing a third embodiment, which is the same as the second embodiment except that the jagged shape of FIG. 4 is changed to a shape with non-uniform dimensions in the vertical direction.

(Other examples)
In the first embodiment, a single-disc filter disk has been described, but it goes without saying that it can also be applied to a multi-disc filter disc.

  As a result, conventionally, the rotating roller parts are required for the rolling contact, but they become unnecessary and the number of parts can be reduced, so that the manufacturing cost can be reduced.

  In addition, since the constraint conditions are relaxed, there is an effect that the degree of freedom in design increases.

It is a figure showing the imaging device concerning the 1st example of the present invention. It is a figure showing the filter disc part concerning the 1st example of the present invention. It is a figure showing the filter disc simple substance concerning the 1st example of the present invention. It is the Z section enlarged view of FIG. 3 concerning the 1st Example of this invention. It is the Z section enlarged view of FIG. 3 concerning the 2nd Example of this invention. It is the Z section enlarged view of Drawing 3 concerning the 3rd example of the present invention. It is a figure explaining a prior art example. It is YY sectional drawing of FIG. It is WW sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shooting lens 2 Television camera 3 Mount 4 Filter disk part 5 Color separation prism 6 Imaging elements, such as CCD 7 Main body 8 Knob gear 9 Idler gear 10 Filter disk 11 Various filters 12 Leaf spring

Claims (3)

  In a color separation prism that separates an incident light beam from a photographic lens into a plurality of colors by a plurality of prisms, a concave-convex shape is formed in a filter insertion portion of a filter disk provided with a plurality of filters for selecting color temperature and density. A filter disc characterized by providing a surface.   2. The filter disk according to claim 1, wherein a D-cut portion (a portion that forms a straight line with respect to the light beam) is provided in a filter-insertion portion of the filter disc, and the D-cut portion has an uneven shape. 3. The filter disk according to claim 1, wherein the uneven shape provided on the filter disk is non-uniform.

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