JP2522680Y2 - Beam splitter and compensator holding mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a beam splitter and a compensator holding mechanism of an infrared spectrophotometer which is a kind of a spectrum spectrometer.

[Related Art] A window plate 2 made of KBr is generally used for an infrared beam splitter or a compensator of an infrared spectrophotometer. Such a KBr window plate 2 is fitted into a concave portion 1a formed in a holder 1 as shown in a longitudinal sectional view in FIG. 4 and a front view in FIG. Pressing ring 12 via cushion 11 made of elastic material
And fixed with screws 6.

[Problems to be solved by the invention]

KBr window plate 2 for beam splitter, compensator, etc.
Is an infrared transmitting material made of crystal, which is held down by the holding ring 12 and fixed with the screw 6 as described above.
Accordingly, there is a problem that the KBr window plate 2 is likely to be distorted due to an imbalance in the pressure of the contact surface between the cushion 11 and the KBr window frame 2 or an imbalance in the distribution of force when screwing. When distortion occurs in the KBr window plate 2, the interference of infrared rays deteriorates, which may affect the performance of the apparatus itself. This invention has been made with a focus on such a problem, and the KBr such as a beam splitter and a compensator is used.
Provided are a beam splitter and a compensator holding mechanism that do not apply an unbalanced force when attaching a window plate to a holder, and do not apply an unbalanced force during holding and do not deteriorate infrared interference. The purpose is.

[Means for solving the problem]

That is, the present invention provides a beam splitter and a compensator holding mechanism in which a beam splitter or a compensator having a flat surface is fitted into a concave portion of a holder, and a guide plate is provided behind the beam splitter or the compensator as a means for solving the above problem. Each ball fitted in a plurality of holes drilled at predetermined intervals in the circumferential direction on the plane is held by holding a leaf spring provided in alignment with the position of the holes drilled at the predetermined interval on the holding plate. It is characterized by doing.

[Action]

When the beam splitter and the compensator holding mechanism are configured as described above, the holder 1 can hold the KBr window plate 2 of the beam splitter or the compensator simply by pressing the ball 4 with the leaf spring 5a. Moreover, in this case, the contact state of the KBr window plate 2 is point contact, so that the KBr window plate 2
No extra bending or twisting is applied to the cutter. Further, since the ball 4 is pressed by the leaf spring 5a, the ball 4 can be pressed with a constant force irrespective of how the screw 6 is tightened, so that the distortion of the KBr window plate 2, which is a beam splitter, can be suppressed to a certain range. In addition, attachment and detachment become extremely simple.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a beam splitter and a compensator (hereinafter referred to as KBr window plate for convenience) holding mechanism of the present invention, and FIG. 2 is a front view thereof.

A concave portion 1a is formed on one side of a holder 1 having both side surfaces flat, into which a KBr window plate 2 having a flat surface is fitted. Then, on the same side where the KBr window plate 2 is fitted, a third
As shown in the figure, a guide plate 3 is provided in which a plurality of holes 3a drilled at predetermined intervals in the circumferential direction on a plane are drilled at three positions (not limited to three, but this degree is appropriate) at 120 degree intervals. , The hole 3a
A ball 4 made of stainless steel is fitted into the glass plate, and the ball 4 is brought into contact with the KBr window plate 2 from behind.

In addition, leaf springs 5 are provided radially inward at the same 120 degree intervals in the circumferential direction.
The holding plate 5 formed with a is superimposed on the guide plate 3, the leaf spring 5 a is brought into contact with the ball 4, and the holder 1, the guide plate 3 and the holding plate 5 are fixed with screws 6. In this case, the ball 4 to be fitted into the hole 3a of the guide plate 3 is made of stainless steel in order to prevent rust. Therefore, other materials such as ceramics and titanium may be used as long as they can prevent rust and can be manufactured with high accuracy.

Thus, if the beam splitter and the compensator holding mechanism are configured as described above, the KBr window plate 2 can be fixed and held on the holder 1 only by pressing the ball 4 with the leaf spring 5a. Moreover, in this case, since the KBr window plate 2 is in contact with the back of the KBr window plate 2 at point contact, no extra bending or twisting is applied to the KBr window plate 2. In addition, leaf springs
Since the ball 4 is pressed with 5a, the ball 4 can be pressed with a constant force regardless of how the screw 6 is tightened. Accordingly, the distortion of the KBr window plate 2 can be suppressed to a certain range,
Installation and removal are also extremely simple.

[Effect of the invention]

Since the beam splitter and the compensator holding mechanism of the present invention are configured as described above in detail, when the KBr window plate, that is, the beam splitter or the compensator, etc. is attached to the holder, the beam is held with an equal force and the distortion at the time of holding is minimized. Thus, the infrared interference can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the beam splitter and compensator holding mechanism of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a front view of a guide plate, and FIG. 4 is a longitudinal section of a conventional beam splitter and compensator holding mechanism. FIG. 5 is a front view thereof. DESCRIPTION OF SYMBOLS 1 ... Holder 2 ... KBr window plate (beam splitter and compensator) 3 ... Guide plate 4 ... Ball 5 ... Holding plate 5a ... Leaf spring 6 ... Screw

Claims (1)

(57) [Scope of request for utility model registration] 1. A beam splitter or a compensator having a flat surface is fitted into a concave portion of a holder, and a rear portion of the beam splitter or the compensator is fitted into a plurality of holes formed in a guide plate at predetermined intervals in a circumferential direction on a plane. A beam splitter and a compensator holding mechanism, wherein a held ball is held by contacting a leaf spring provided at a position of the hole formed in the holding plate at a predetermined interval.