JPH0629699Y2 - Spectrophotometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a spectrophotometer used for qualitative analysis or quantitative analysis of a sample.

(Prior Art) An example of a spectrophotometer is schematically shown in FIG. 1 is a light source, 2
Is a light source condensing element such as a collimator mirror, 3 is a spectroscope unit, 4 is a sample, and 5 is a detector. The light emitted from the light source 1 is condensed by the light source condensing element 2 on the entrance slit surface 7 including the entrance slit 6 of the spectroscope unit 3. Spectrometer section 3
Is equipped with a diffraction grating and a prism, irradiates the sample 4 with the continuous light incident from the entrance slit 6 as monochromatic light, and the transmitted light from the sample 4 is detected by the detector 5.

At the time of shipping the spectrophotometer, the center of the light source image on the entrance slit surface 7 and the center of the entrance slit 6 are adjusted to coincide with each other. Then, in order to avoid the influence of outside light and outside air, the spectroscope section 3 and the light source condensing element 2 are covered with the spectroscope section cover, and further the entire spectrophotometer is covered with the cover.

Tungsten lamps and deuterium lamps are used as the light source of the spectrophotometer, but the light source has a limited life and must be replaced. The user usually replaces the light source. However, due to the mechanical accuracy of the lamp and the socket and its structure, it is not guaranteed that the light source will be installed in the correct position when the light source is replaced. If you want to make sure that the light source is installed in the correct position, you have to remove the cover of the entire spectrophotometer, and also remove the cover of the spectroscope unit to check the position of the light source image on the entrance slit surface. Actually, the user could not confirm the light source position.

Therefore, in some conventional spectrophotometers, some allowance is provided at the light source position by allowing the optical system to have a margin. Further, there is also a device in which the light source position is adjusted so that the instruction of the recorder or the meter is maximized.

(Problems to be solved by the invention) The former light source position with an allowable amount has a problem that the light amount is lost.

The latter method of adjusting while looking at the instructions is also a fumbling task and is inefficient.

Furthermore, when attempting to make a measurement using a light source other than the light source provided as a standard in the spectrophotometer, it is difficult for the user to carry out the measurement while supporting the light source with a simple experimental device, There is also the inconvenience that a special light source support device prepared by the manufacturer is required.

The present invention makes it possible to look into the entrance slit of the spectroscope unit without removing the entire spectrophotometer cover or the spectroscope unit cover, and adjust the light source position while observing the position of the light source image on the entrance slit surface. The purpose of the present invention is to provide a spectrophotometer that can be confirmed.

(Means for Solving the Problems) The spectrophotometer of the present invention will be described with reference to FIG. 1 showing an embodiment. The spectrophotometer cover 11 on the light entrance side of the entrance slit 6 of the spectroscope section 3 will be described. A transparent window 13 of an airtight structure having a size that allows the entrance slit 6 to be seen from the outside is provided, and the cover 12 of the entire spectrophotometer is provided with the window 13 of the spectroscope section cover.
A retractable light-shielding window 14 having a size that allows the entrance slit 6 to be seen is provided at a position where the entrance slit 6 can be seen through.

(Embodiment) FIG. 1 shows the vicinity of the entrance slit portion of the spectrophotometer of one embodiment.

Reference numeral 10 denotes a base, and on the base 10, a spectroscope unit 3, a light source condensing element 2, and a light source chamber and a sample chamber, which are not shown, are supported. Reference numeral 11 is a spectroscope section cover that covers the spectroscope section 3 and the light source condensing element 2, 12 is a cover that covers the entire spectrophotometer, and both covers 11 and 12 are fixed to the base 10. The light source chamber in which the light source is housed is connected to the side of the spectroscope section cover 11 (the back side in the direction perpendicular to the paper surface) in communication with the space or through a transparent glass window, and is provided outside the cover 12. It is protruding.

The entrance slit 6 of the spectroscope unit 3 is provided in the spectroscope unit cover 11.
A window 13 made of a transparent member having a size that allows the entrance slit 6 to be seen from the outside is provided at an upper position on the light incident side, that is, an upper position of the chamber in which the light source condensing element 2 is provided. The window 13 can be configured by, for example, adhering a transparent glass plate or an acrylic resin plate to the opening formed in the spectroscope section cover 11. The cover 12 that covers the entire spectrophotometer includes the transparent window 13 of the spectroscope unit cover 11.
A window 14 having a size that allows the entire entrance slit 6 to be viewed is provided at a position through which the entrance slit 6 can be viewed, and a lid 15 that can be opened and closed by a hinge or the like is attached to the opening 14. There is.

When the light source is replaced, the lid 15 is opened, the entrance slit 6 is viewed, and it is confirmed whether the center of the light source image on the entrance slit surface 7 coincides with the center of the entrance slit 6. If the light source image is out of position, the light source mounting position may be adjusted while observing the light source image on the entrance slit surface 7.

When using a light source other than the light source provided as a standard in the spectrophotometer, the lid 15 may be opened and the light source position may be adjusted while viewing the light source image on the entrance slit surface 7 in the same manner as described above.

At the time of measurement, the lid 15 is closed to avoid the influence of external light.

A lid 15 for the opening 14 of the cover 12 covering the entire spectrophotometer
May be formed integrally with, for example, the light source chamber cover instead of being attached by a hinge as in the embodiment, and the opening 14 may be exposed when the light source chamber cover is removed when replacing the light source. Good.

The spectrophotometer has a single-beam type and a double-beam type, but the present invention can be applied to any type of spectrophotometer.

(Effect of the device) According to the spectrophotometer of the present invention, the light source image on the entrance slit surface of the spectroscopic unit can be viewed from the outside without removing the cover of the entire spectrophotometer or the spectroscopic unit cover. It becomes easy to attach the light source to the correct position when the light source is exchanged without disturbing the atmosphere in the spectroscope section, and to confirm that the light source is properly attached.

Further, even when using a light source other than the light source provided as a standard in the spectrophotometer, it becomes easy to adjust and confirm the mounting position of the light source, so that the user can perform various experiments with a simple experimental device. It is also easy to measure the spectral radiant energy of the light source.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing the vicinity of an entrance slit of a spectrophotometer according to an embodiment of the present invention, and FIG. 2 is a schematic perspective view showing a general spectrophotometer. 3 ... Spectroscope unit, 6 ... Inlet slit, 11 ... Spectroscope unit cover, 12 ... Spectrophotometer cover, 13 ... Spectroscope cover window, 14 ... Spectrophotometer cover Windows.

Claims (1)

[Scope of utility model registration request] 1. A transparent window having an airtight structure having a size that allows the entrance slit to be seen from the outside is provided on the spectroscope section cover on the light incident side of the entrance slit of the spectroscope section, and the cover of the entire spectrophotometer is provided. Is a spectrophotometer in which an opening / closing light-shielding window is provided at a position where the entrance slit can be seen through the window of the spectroscope cover.