JP2001042204A - Mounting structure of spectral prism - Google Patents

Abstract

(57) [Problem] To provide a mounting structure of a spectral prism that can easily assemble a spectral prism and a prism base, and that can reduce the number of parts and the number of assembly steps. SOLUTION: A concave portion 4b for accommodating a screw member 1 having a fitting shaft portion 1a penetrating the prism base 4 and the camera housing 3 is provided on one side surface 4a of the prism base 4, and the prism base 4 and the camera housing are provided. 3 is provided with a fitting hole 6 through which the fitting shaft 1a of the screw member 1 fits and penetrates, and a camera housing 3 is provided at the tip of the fitting shaft 1a of the screw member 1 passing through the fitting hole 6. The structure is such that the fixing member 2 is fixed on the side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectroscopic prism mounting structure for mounting a spectroscopic prism for decomposing an incident light beam into a plurality of color lights using a plurality of prisms and emitting the same through a prism base to a camera housing. is there.

[0002]

2. Description of the Related Art Conventionally, in a color television camera or the like, a spectral prism has been used between an objective lens (imaging lens) and imaging means (for example, an imaging tube or an individual imaging device). The spectral prism mainly includes a prism block formed by integrally combining three or four prisms each having a multilayer film of a predetermined shape on one surface. Then, the configuration is such that an incident light beam incident from the objective lens is decomposed into color components of a plurality of wavelength bands via the reflecting surface of each prism, and is guided to a predetermined color separation imaging device.

FIGS. 12 and 13 show a conventional structure for mounting a spectral prism.

FIG. 12 is a sectional view showing a mounting structure of a spectral prism, and FIG. 13 is an enlarged view of a main part of FIG.

[0005] As shown in FIG.
The prism base 15 is made of a member having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of the prism, and the female screw 11 is housed in a recess 15 a provided on one side of the prism base 15 in a state where the female screw 11 is prevented from rotating. Adhesively fixed on one side.

Further, in the spectral prism 5, a mounting screw 10 inserted from the other side of the prism base 15 is screwed into a female screw 11 of the prism base 15, so that the camera housing 1 is mounted.
It is common to mechanically attach to 4.

At this time, the spectral prism 5 and the camera housing 14
Relative to the prism base 15, a fitting hole 13 is provided on the other side surface of the prism base 15, and the positioning pin 1 is provided in the camera housing 14.
6 and the like, and a part of the positioning pin 16 is
Generally, the fitting is performed by fitting into the fitting hole 13.

[0008]

However, in the above-described structure for mounting the spectral prism, since the inner diameter portion (screw hole portion) of the female screw into which the mounting screw is screwed penetrates the female screw, water is more radiated from the inner diameter portion of the female screw. And the like may enter the spectral prism side and adversely affect the spectral prism. In order to prevent this, a seal member or the like for closing the screw hole is required, but if the seal member is used, the assembly of the spectral prism and the prism base becomes complicated.

Furthermore, the positional relationship between the camera housing and the spectral prism is not uniquely determined only by the mounting screws, and it is necessary to provide two positioning pins or fitting holes on the camera housing and the prism base. , Increase in the number of parts
This was a factor that led to an increase in the number of assembly steps.

The present invention is a further development of the above-mentioned prior art, and its main object is to facilitate the assembly of the spectral prism and the prism base, and to reduce the number of parts and the number of assembly steps. It is an object of the present invention to provide a mounting structure for a spectral prism that can be mounted.

[0011]

According to the present invention, there is provided a spectral prism mounting structure comprising: (1) a prism for adhering and fixing to one side a spectral prism for decomposing an incident light beam into a plurality of color lights by using a plurality of prisms and emitting the light; A mounting structure for a spectral prism to be mounted on a camera housing via a base, a recess for accommodating a screw member having a fitting shaft penetrating the prism base and the camera housing on one side surface of the prism base. Is established,
A fitting hole through which the fitting shaft of the screw member is fitted and provided in the prism base and the camera housing is provided at a tip of the fitting shaft of the screw member passing through the fitting hole. It is characterized in that a fixing member is fixed on the camera housing side.

[0012] In particular, (1-2) the mounting structure of the spectral prism of the above (1), wherein two screws are provided. (1-3) In the mounting structure of the spectral prism of the above (1), the screw is provided. The member includes two fitting shaft portions, and a fastening member is fixed to a tip of the two fitting shaft portions;
(1-4) In the structure for mounting a spectral prism according to the above (1), the screw member includes two fitting shaft portions, and is fixed to a tip of one of the two fitting shaft portions. It is characterized in that the attachment member is fixed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIGS. 1 to 3 show a mounting structure of a spectral prism according to this embodiment.

FIG. 1 is a sectional view showing a mounting structure of a spectral prism, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a view of a prism base viewed from a direction A shown in FIG.

1 to 3, reference numeral 1 denotes a fitting shaft 1a.
A screw member with 2; a fastening member such as nuts;
Reference numeral 3 denotes a camera housing, 4 denotes a prism base, and 5 denotes a spectral prism.

The spectral prism 5 is composed of a prism block formed by integrally combining three or four prisms having a multilayer film of a predetermined shape on one surface. Then, an incident light beam incident from an objective lens (not shown) built in the camera housing 3 is separated into color components of a plurality of wavelength bands through reflection surfaces of the respective prisms to obtain a predetermined color separation image sensor. (Not shown).

The prism base 4 is made of a member having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of the prism constituting the spectral prism 5. The prism base 4 is provided with a concave portion 4b and a fitting hole 6 communicating with the concave portion 4b in two directions on one side surface 4a to which the spectral prism 5 is adhered and fixed, in a direction orthogonal to the optical axis of the objective lens. . Then, the bottom surface 5a of the spectral prism 5 is bonded and fixed to one side surface 4a in a state where the screw member 1 is inserted into the concave portion 4b from the fitting shaft portion 1a side and housed. The screw member 1 is inserted into the recess 4b and the fitting hole 6 while being prevented from rotating.

The camera housing 3 has a support base 3a for supporting the prism base 4 in a part thereof. The support 3a extends parallel to the optical axis of the objective lens incorporated in the camera housing 3. The support base 3 a is provided with a fitting hole 6 for fitting with the fitting shaft portion 1 a of the screw member 1 so as to communicate with the fitting hole 6 of the prism base 4. Then, the fitting shaft portion 1a of the screw member 1 protruding from the other side surface 4c of the prism base 4 penetrates through the fitting hole 6, and the screw portion 1b at the tip of the fitting shaft portion 1a is placed on the back side of the support base 3a. Projecting.

The screw portion 1b of the fitting shaft portion 1a of the screw member 1 protruding from the back side of the support 3a of the camera housing 3.
The fastening members 2 such as nuts are fastened from the support base 3a side.

Thus, the spectral prism 1 is attached to the camera housing 3 via the prism base 4.

In the mounting structure of this embodiment, the other side surface 4c of the prism base 4 is provided on the support base 3a side of the camera housing 3.
Screw part 1b of fitting shaft part 1a of screw member 1 protruding from the side
Since the fixing members 2 such as nuts can be screwed into the camera housing 3, the spectral prism 5 can be mechanically attached to the camera housing 3 via the prism base 4.

The fitting shaft portion 1 of the screw member 1 housed in two concave portions 4b provided on one side surface 4a of the prism base 4.
a engages with the prism base 4 and the camera housing 3 to perform positioning and relative rotation control between the prism base 4 and the camera housing 3, so that a conventional positioning pin or fitting length is used. Holes can be reduced, and the number of parts and the number of assembly steps can be reduced.

Further, since there is no penetrating portion unlike the conventional female screw, entry of moisture or the like can be prevented, and the optical performance of the spectral prism 5 can be maintained in a good state.
In addition, a seal member or the like used for the purpose of preventing invasion of moisture or the like is not required, so that the assembling is simplified.

(Second Embodiment) FIGS. 4 to 7 show a mounting structure of a spectral prism according to this embodiment.

FIG. 4 is a sectional view showing a mounting structure of the spectral prism, FIG. 5 is an enlarged view of a main part of FIG. 4, FIG. 6 is a view of a prism base viewed from a direction A shown in FIG. 7A is a plan view of the screw member, and FIG. 7B is a front view of the screw member.

In this embodiment, the same reference numerals are given to the same parts as those of the above-described first embodiment, and the description thereof will be omitted.

The mounting structure of the spectral prism shown in this embodiment is obtained by integrating the screw member of the first embodiment described above. Along with this, the concave portion of the prism base is also formed in a long hole as shown in FIG. Other configurations are the same as those of the above-described first embodiment.

That is, in the present embodiment, an elongated hole-shaped concave portion 8b is formed on one side surface 8a of the prism base 8 to which the spectral prism 5 is adhered and fixed, in a direction orthogonal to the optical axis of the objective lens incorporated in the camera housing 3. And a fitting hole 6 communicating with the recess 8b. Then, the screw member 7 is fitted into the recess 8b.
The bottom surface 5a of the spectral prism 5 is adhered and fixed to one side surface 8a in a state of being inserted and stored from the side a. The screw member 7 is
It is inserted into the recess 8 b and the fitting hole 6 while being prevented from rotating.

The screw portion 7b of the fitting shaft portion 7a of the screw member 7 protruding from the back side of the support base 3a of the camera housing 3.
The fastening members 2 such as nuts are fastened from the support base 3a side.

Also in the mounting structure of this embodiment, nuts and the like are provided on the screw portion 8b of the fitting shaft portion 8a of the screw member 8 protruding from the other side surface 8c side of the prism base 8 on the support base 3a side of the camera housing 3. Can be screwed together, so that the spectral prism 5 can be mechanically attached to the camera housing 3 via the prism base 8.

The fitting shaft portion 7 of the screw member 7 housed in the elongated hole-shaped concave portion 8b provided on one side surface 8a of the prism base 8 is provided.
a engages with the prism base 8 and the camera housing 3 to perform positioning and relative rotation control between the prism base 8 and the camera housing 3. Holes can be reduced, and the number of parts and the number of assembly steps can be reduced.

Further, since there is no penetrating portion unlike the conventional female screw, intrusion of moisture and the like can be prevented, and the optical performance of the spectral prism 5 can be maintained in a good state.
In addition, a seal member or the like used for the purpose of preventing invasion of moisture or the like is not required, so that the assembling is simplified.

(Third Embodiment) FIGS. 8 to 11 show a mounting structure of a spectral prism according to this embodiment.

FIG. 8 is a sectional view showing the mounting structure of the spectral prism, FIG. 9 is an enlarged view of a main part of FIG. 8, FIG. 10 is a view of the prism base viewed from the direction A shown in FIG. FIG.
1A is a plan view of a screw member, and FIG. 1B is a front view of the screw member.

In this embodiment, the same reference numerals are given to the same parts as those of the above-described first embodiment, and the description thereof will be omitted.

The mounting structure of the spectral prism shown in the present embodiment has a shape in which the screw member of the first embodiment described above is integrated and the screw portion of one of the fitting shaft portions is eliminated. In the present embodiment, by using the screw member having such a shape, the fitting shaft portion without the screw portion is provided with a function of only restricting relative rotation between the prism base and the camera housing. Other configurations are the same as those of the above-described first embodiment.

That is, in the present embodiment, an elongated hole-shaped concave portion 8b is provided on one side surface 8a of the prism base 8 to which the spectral prism 5 is adhered and fixed, in a direction orthogonal to the optical axis of the objective lens incorporated in the camera housing 3. And a fitting hole 6 communicating with the recess 8b. The screw member 9 is inserted into the recess 8b.
The bottom surface 5a of the spectral prism 5 is adhesively fixed to one side surface 8a in a state of being inserted and stored from the side a. The screw member 9 is
It is inserted into the recess 8 b and the fitting hole 6 while being prevented from rotating.

Then, the fastening members 2 such as nuts are fastened from the support base 3a side to the screw parts 9b of the one fitting shaft part 9a of the screw member 9 protruding from the back side of the support base 3a of the camera housing 3. I have. Here, the fitting shaft portion 9a having no screw portion is fitted in the fitting hole 6 of the prism base 8 and the support base 3a, but does not protrude from the back side of the support base 3a. It has a function of only restricting rotation relative to the housing 3.

Also in the mounting structure of this embodiment, one fitting shaft portion 9a of the screw member 9 protruding from the other side surface 8c of the prism base 8 on the support base 3a side of the camera housing 3.
Since the fixing members 2 such as nuts can be screwed into the screw portions 9 b of the above, the spectral prism 5 can be mechanically attached to the camera housing 3 via the prism base 8.

The fitting shaft 9 of the screw member 9 housed in the elongated hole-shaped recess 8b provided on one side surface 8a of the prism base 8 is provided.
a engages with the prism base 8 and the camera housing 3 to perform positioning and relative rotation control between the prism base 8 and the camera housing 3. Holes can be reduced, and the number of parts and the number of assembly steps can be reduced.

Further, since there is no penetrating portion unlike the conventional female screw, the invasion of moisture or the like can be prevented, and the optical performance of the spectral prism 5 can be maintained in a good state.
In addition, a seal member or the like used for the purpose of preventing invasion of moisture or the like is not required, so that the assembling is simplified.

[0043]

As described above, the mounting structure of the spectral prism of the present invention can easily assemble the spectral prism and the prism base, and can reduce the number of parts and the number of assembling steps. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mounting structure of a spectral prism according to a first embodiment.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a view of a prism base viewed from a direction A shown in FIG. 1;

FIG. 4 is a sectional view showing a mounting structure of a spectral prism according to a second embodiment.

FIG. 5 is an enlarged view of a main part of FIG. 4;

FIG. 6 is a view of a prism base viewed from a direction A shown in FIG. 4;

7A is a plan view of a screw member, and FIG. 7B is a front view of the screw member.

FIG. 8 is a sectional view showing a mounting structure of a spectral prism according to a third embodiment.

FIG. 9 is an enlarged view of a main part of FIG. 8;

FIG. 10 is a view of a prism base viewed from a direction A shown in FIG. 8;

11A is a plan view of a screw member, and FIG. 11B is a front view of the screw member.

FIG. 12 is a sectional view showing a conventional structure for mounting a spectral prism.

FIG. 13 is an enlarged view of a main part of FIG. 12;

[Explanation of symbols]

 1, 7, 9 Screw member 1a, 7a, 9a Fitting shaft portion 3 Camera housing 4, 8 Prism stand 4c, 8a One side surface 5 Spectral prism 6 Fitting hole

Claims (4)

[Claims] 1. A mounting structure of a spectral prism, which is mounted on a camera housing via a prism base that adheres and fixes a spectral prism that separates an incident light beam into a plurality of color lights and emits the light using a plurality of prisms on one side surface. A recess for accommodating a screw member having a fitting shaft penetrating the prism base and the camera housing on one side surface of the prism base, and fitting the screw member to the prism base and the camera housing; It is provided that a fitting hole through which the mating shaft portion is fitted and penetrated is provided, and a fixing member is fixed to the end of the fitting shaft portion of the screw member penetrating the fitting hole on the camera housing side. Characteristic prism mounting structure. 2. The prism mounting structure according to claim 1, further comprising two screw members. 3. The prism mounting structure according to claim 1, wherein the screw member has two fitting shaft portions, and a fastening member is fixed to a tip of the two fitting shaft portions. 4. The screw member according to claim 1, wherein the screw member includes two fitting shaft portions, and a fastening member is fixed to a tip of one of the two fitting shaft portions. A prism mounting structure characterized in that: