JP5541460B2 - Spectrometer - Google Patents

Description

  The present invention relates to a spectrophotometer that is used as a component of a spectrophotometer that performs qualitative quantitative analysis of various types of samples and a fluorescence detector for liquid chromatography.

  The spectroscopic device has a function of selectively emitting only light of a specific wavelength from light over a wide wavelength range emitted from a light source such as a halogen lamp, a deuterium lamp, or a xenon lamp. It is widely used as a constituent element such as a meter, a fluorescence spectrophotometer, a UV detector or a fluorescence detector of a liquid chromatograph.

  As shown in FIG. 5, the most common example of a spectroscopic device that has been conventionally used is constituted by a light source unit 1 and a spectroscopic unit 2.

  The light source unit 1 includes a light source 4 and a condensing mirror 5, and light emitted from the light source 4 becomes convergent light by the condensing mirror 5, passes through the window plate 6, and then focuses on an external point. It is installed and oriented to tie. The light source 4 may be a deuterium lamp or halogen lamp when used in an absorption spectrophotometer, a xenon lamp when used in a fluorescence spectrophotometer, or a UV detector for liquid chromatography. When used in a deuterium lamp or a fluorescence detector for liquid chromatograph, a deuterium lamp or a xenon lamp is generally used and is turned on by a lighting power source (not shown in FIG. 5) corresponding to each type. The

  The spectroscopic unit 2 includes a window plate 7, an entrance slit 8, a collimator mirror 9, a diffraction grating 10, a condensing mirror 11, a plane mirror 12, an exit slit 13, and a window plate 14 in the order in which the light flux passes through. The optical path length from the slit 8 to the collimator mirror 9 is set equal to the focal length of the collimator mirror 9, and the optical path length from the condenser mirror 11 through the plane mirror 12 to the exit slit 13 is set equal to the focal length of the condenser mirror 11. Each optical element is arranged. As a result, the diffused light exiting the entrance slit 8 becomes a parallel light beam by the collimator mirror 9 and enters the diffraction grating 10. The parallel light beam reflected by the diffraction grating 10 is condensed by the condenser mirror 11 and focused on the exit slit 13.

  The diffraction grating 10 has a structure capable of rotating around a straight line perpendicular to the paper surface through the center of the reflecting surface. When this rotation angle is changed, the diffraction grating 10 is emitted to the outside through the exit slit 13 and the window plate 14. Wavelength changes. Therefore, the wavelength of the emitted light can be accurately selected.

  The light source unit 1 and the spectroscopic unit 2 are arranged with a spacer 3 having an opening for passing a light beam therebetween. The thickness of the spacer 3 is determined so that the light emitted from the light source unit 1 is accurately focused on the entrance slit 8 of the spectroscopic unit 2.

  The output of the above-described spectroscopic device is emitted from the window plate 14 of FIG. 5 and then guided to various measuring units according to the purpose. For example, in the case of a fluorescence detector for a liquid chromatograph, the light enters the flow cell through which the sample passes through an optimum condensing optical system. The fluorescence of the sample excited and emitted by the incident light is sent to a detector by another optical system, and is detected and measured.

  Although prior art literature information on spectroscopic devices was investigated, it was not found.

  However, the above-described conventional spectroscopic device has the following drawbacks. That is, the temperature of the spectroscopic unit 2 rises due to the heat generated by the light source unit 1, thereby causing a problem that the wavelength of the output light changes or the intensity of the output light fluctuates. In a fluorescence detector for liquid chromatography that requires particularly strong output light intensity, a xenon lamp is often used as the light source 4, but this light source is not only used for light intensity but also for other types of light sources. Much bigger than that.

  For this reason, the temperature of the light source unit 1 rises, heat is conducted to the spectroscopic unit 2 through the spacer 3, and the temperature of the spectroscopic unit 2 tends to rise. In order to prevent this temperature rise, it is necessary to manufacture the spacer 3 with a material having as low a thermal conductivity as possible, but there are problems such as material cost, workability, and material strength.

The present invention includes a light source unit that includes a light source that emits light in a predetermined wavelength range in order to solve the above-described problems,
A spectroscopic unit that separates light from the light source unit and extracts light of a desired wavelength ;
In the spectroscopic device that includes an opening portion that allows the light beam from the light source unit to pass through the spectroscopic unit, and is configured by a heat sink that is sandwiched between the light source unit and the spectroscopic unit via spacers, respectively .
A surface for the light source unit side, in terms with respect to the spectroscopic unit, the spacer is of being found provided displaced.

  With the spectroscopic device according to the present invention, the distance between the light source unit and the spectroscopic unit is ensured, and the heat conducted from the light source unit to the spacer is dissipated to the outside by the radiation fins, so that the temperature of the spacer does not easily rise. No adverse effect on the spectroscopic unit.

It is a figure which shows one Example of this invention. It is a plane head of the heat sink of this invention. It is sectional drawing of the heat sink of this invention. It is a figure which shows a reference example It is a figure which shows the example of the conventional spectroscopy apparatus.

  In order to prevent the heat generated by the light source unit from being transmitted to the spectroscopic unit, it is desirable to release the heat to the outside in the portion of the light source unit that mediates the spectroscopic unit, and a heat sink having a large number of fins is used in the mediation portion.

  FIG. 1 shows an embodiment of the present invention. As shown in the figure, the spectroscopic device according to this embodiment is composed of a light source unit 1 and a spectroscopic unit 2, and a heat radiating plate 15 is sandwiched between both via a spacer 16.

  The light source unit 1 and the spectroscopic unit 2 are the same in structure and function as those of the conventional apparatus shown in FIG. 5 and will not be described in detail.

  Although the heat sink 15 and the spacer 16 are integrally processed, their external appearances are shown in FIGS. FIG. 2 is a plan view of the heat radiating plate 15, and FIG. 3 is a view of the SS ′ cross section in FIG. 2 as viewed from the right side.

  The heat radiating plate 15 has a shape having a large number of heat radiating fins 19 on both sides, and is manufactured using a material having high thermal conductivity such as aluminum. The heat radiating plate 15 is provided with an opening A through which a light beam passes. In addition, three spacers 16 are attached to both surfaces of the heat radiating plate 15 so as to form an angle of 120 degrees with respect to the center of the opening A. A hole B for screwing passes through the center of each spacer 16.

  Further, the three spacers 16 on one surface of the heat radiating plate 15 and the three spacers 16 on the other surface are attached so as to be offset from each other by an angle of 60 degrees with respect to the center of the opening A. Such an assembly of the heat radiating plate 15 and the spacer 16 can be manufactured by welding a sleeve processed from aluminum to a commercially available heat radiating plate made of aluminum drawing material, or a fin and sleeve for radiating heat and Can be manufactured as an aluminum die-cast at the same time.

  The manufactured heat radiating plate 15 is screwed to the casing 17 of the light source unit 1 and the casing 18 of the spectroscopic unit 2 using the central hole B of the six spacers 16.

  The sum of the thickness of the heat sink 15 and the length of the spacer 16 separates the light source unit 1 and the spectroscopic unit 2 from each other. The isolation length is determined by the light emitted from the light source unit 1 when the spectroscopic device is assembled. 2 is designed and manufactured in such a way that the focal point is accurately focused on the entrance slit 8 in the interior 2.

  When the spectroscopic device configured as described above is operated, the temperature of the light source unit 1 rises due to heat generated by the light source 4, and heat is conducted to the heat radiating plate 15 through the housing 17 and the spacer 16. However, since the heat radiating plate 15 is cooled by the outside air through the large number of heat radiating fins 19, the temperature rise of the heat radiating plate 15 is suppressed to a minimum. As a result, the amount of heat flowing from the radiator plate 15 to the casing 18 of the spectroscopic unit 2 through the spacer 16 is also minimized. Further, since the spacers 16 on both surfaces of the heat radiating plate 15 are offset from each other by 60 degrees, there is no direct heat transfer path from the housing 17 of the light source unit 1 to the housing 18 of the spectroscopic unit 2. Therefore, the amount of heat flowing to the spectroscopic unit 2 is reduced.

The shape of the spacer 16 and the shape of the heat dissipating fins 19 are not limited to the above embodiments, and various modifications can be considered.
4A and 4B are a front view and a cross-sectional view, which are reference examples in which a plurality of layers of heat radiation fins 19 are integrally processed on the outer periphery of a cylindrical spacer 16.

As described above, in the spectroscopic device of the present invention, the heat flowing from the light source unit 1 to the spectroscopic unit 2 is minimized, and thereby the temperature rise of the spectroscopic unit 2 is minimized, and wavelength fluctuations and light A spectroscopic device capable of minimizing measurement problems such as intensity fluctuations can be realized. Examples of the spacer include various modifications other than those shown in FIGS. 1 to 3 , and are not limited to the illustrated examples.

  The present invention can be used in a spectroscopic device used in a spectrophotometer or a liquid chromatograph detector.

DESCRIPTION OF SYMBOLS 1 Light source unit 2 Spectrometer unit 3 Spacer 4 Light source 5, 11 Condenser mirror 6, 7, 14 Window plate 8 Entrance slit 9 Collimator mirror 10 Diffraction grating 12 Plane mirror 13 Exit slit 15 Heat sink 16 Spacer 17, 18 Case 19 Radiation fin A opening B hole

Claims (1)

A light source unit containing a light source that emits light in a predetermined wavelength range;
A spectroscopic unit that separates light from the light source unit and extracts light of a desired wavelength ;
In the spectroscopic device that includes an opening portion that allows the light beam from the light source unit to pass through the spectroscopic unit, and is configured by a heat sink that is sandwiched between the light source unit and the spectroscopic unit via spacers, respectively .
A surface for the light source unit side, in terms with respect to the spectroscopic unit, the spectroscopic apparatus the spacer is equal to or are found provided displaced.

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