JPS592512Y2 - Spectrophotometer wavelength selection switching fixing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wavelength selection switching fixing device for a spectrophotometer.
In particular, the present invention relates to a device for switching and fixing wavelengths suitable for use as a detector in a liquid chromatography device or the like.

In devices such as liquid chromatography devices, where the sample to be measured is divided and sequentially passed through a flow path, the wavelength used by the spectrophotometer, which is the detector, must be selected depending on the sample to be analyzed. There are many.

This type of detector sequentially flows a sample into a sample cell, irradiates the sample with light while it is in the cell, and measures the absorbance based on the sample.

A spectrophotometer used as a detector in a general-purpose liquid chromatography device or the like is required to be able to easily and easily switch wavelength selection and to be able to fix the wavelength.

In conventional spectrophotometers, the wavelength cam axis was electrically fixed to fix wavelength switching, so if the power was cut off, the set wavelength cam position would shift and it was difficult to reproduce the wavelength cam value position. .

The object of the present invention is to provide a wavelength selection device for a spectrophotometer that reasonably solves these problems.

Fig. 1 shows a conventional example, in which 1 is a dispersion element such as a diffraction grating, 2 is a dispersion drive shaft, and the dispersion drive shaft 2 is provided with the dispersion element 1 at one end, and the other end is disposed on the dispersion drive shaft 2. is provided with a disperser drive lever 3.

The wavelength cam contactor 4 at the end of the dispersion element drive lever 3 is always in contact with the outer periphery of the continuous wavelength cam 7.

The continuous wavelength cam 7 is equipped with a wavelength scale plate 8 for reading wavelength values, and by aligning this wavelength scale with the index 9 of the reference scale, the wavelength cam contactor 4 in contact with the outer periphery of the continuous wavelength cam 7 is dispersed. It rotates around the child drive shaft 2, thereby rotating the dispersion element 1 and switching it to a predetermined angular position so that the wavelength value can be set.

Further, the wavelength cam mounting shaft 6 is electrically fixed by the cam shaft fixing portion 5.

The end of the wavelength cam mounting shaft 6 is tightened with a fixing screw 10.

In this way, the continuous wavelength cam 7 is fixed by electrically fixing the wavelength cam mounting shaft 6 using the cam shaft fixing part 5, but if the power is cut off for some reason such as a switch being cut or a fuse blowing out, the cam Since the shaft fixing portion 5 releases the fixation of the wavelength cam mounting shaft 6, the continuous wavelength cam 7 rotates under its own weight, resulting in a change in set value.

The embodiment of the invention shown in FIGS. 2 and 3 solves this problem.

FIGS. 2 and 3 illustrate the vicinity of the cam attachment shaft of the embodiment device, and the shape of the wavelength cam and the method of rotating the dispersion element are the same as those in FIG. 1.

FIG. 2 is an exploded perspective view, and FIG. 3 is a sectional view of the fixed state.

A stator 14 is attached to the continuous wavelength cam 7 and has a disk shape with a T-shaped cross section and a tapered portion on the side surface.

The camshaft bearing part 13 is provided independently of the wavelength cam 7, and the stator member 11 is attached to this bearing part 13.

This fixed child is formed into a hollow cylindrical shape.

The wavelength cam 7 is fixed to the wavelength cam mounting shaft 6 by tightening the cam shaft fixing screw 12.

The angular position at which the wavelength cam 7 should be stopped is determined by the positional relationship between the stator 14 and the stator girl 11, but if the cam shaft fixing screw 12 is loosened and the angular position of the wavelength cam 7 relative to the wavelength cam mounting shaft 6 is changed, Naturally stator 14 and stator girl 1
Since the angular position of wavelength cam 1 also changes, the wavelength used when wavelength cam 7 is fixed can be changed.

By tightening the camshaft fixing screw 12, the wavelength cam 7 is pressed toward the bearing part 13, so that a tapered part of the stator 14 is tightly fitted to the inner circumference of the stator girl 11, and the wavelength cam 7 is eventually fixed. .

According to such a configuration, even if the power is turned off, the set value of the wavelength cam will not change unless the camshaft fixing screw 12 is loosened.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram for explaining a conventional example, FIG. 2 is an exploded perspective view of a main part of an embodiment of the present invention, and FIG. 3 is a sectional view of a main part of an embodiment of the present invention. 1...Dispersion element, 4...Wavelength cam contactor, 6...Wavelength cam mounting shaft, 7...Wavelength cam, 11... - Fixed child, 12... Camshaft fixing screw, 13... Camshaft bearing part, 14.
·····stator.

Claims (1)

[Scope of utility model registration request] In a wavelength selection switching fixing device for a spectrophotometer that rotates a dispersion element as the wavelength cam rotates, fixes the wavelength cam at a specific angular position, and selects light of a specific wavelength, a stator is attached to the wavelength cam. A spectrophotometer characterized in that the wavelength cam is fixed by attaching a stator to a bearing provided independently of the wavelength cam, and pressing the stator against the stator. Wavelength selection switching fixed device.