JPS61193031A - Driving device for spectral element - Google Patents

Abstract

PURPOSE:To permit easy production and the control of a spectral element without posing any problem in linearity and cost by constituting a speed reducer of a driving member which transmits driving power via a rotating mechanism formed with press-contact grooves and a driven member. CONSTITUTION:File-like micro-ruggedness is formed on the outside peripheral surface of a pulley 4 and the outside peripheral surface 5' of a sectorial plate 5 which contacts therewith is formed of a material which is soft and is slightly deformed by contacting with the file-like micro-ruggedness. On the other hand, a diffraction grating 3 is integrally secured via a supporting shaft to the center of the plate 5. The pulse signal indicating the prescribed function according to a wavelength or wave number linearity is emitted from a microcomputer 6 in accordance with software. A pulse motor 1 revolves at the speed corresponding to the number of the pulses inputted thereto. The rotation thereof is transmitted via the single-reduction speed reducer 2. ¦The grating 3 is driven while the rotating angle thereof is controlled according to the prescribed function. The grating is consequently directly rotationally driven only by the reducer 2 of the rotating mechanism formed with the press-contact grooves improved in the linearity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for rotating a spectroscopic element such as a diffraction grating used in a spectrophotometer linearly in wavelength or linearly in wavenumber. The present invention relates to a spectroscopic element drive device in which transmission is carried out via a rotation mechanism formed by crimp grooves, which is not only easy to manufacture and has a light load, but also has no pack lash and allows the drive angle of the spectroscopic element to be controlled by software without any trouble.

BACKGROUND ART In general, in a spectrophotometer, in order to sequentially extract the separated light from the output slit of the spectrometer, it is necessary to rotate a spectroscopic element such as a diffraction grating in accordance with a predetermined function in a wavelength linear or wavenumber linear manner. Conventionally, the rotation of the motor is reduced to a predetermined reduction ratio using a speed reducer, and then a spectroscopic element such as a diffraction grating is driven to rotate using a sign par or a cam.

However, as is well known, signpers and cams are expensive to manufacture, and adjustment to linearly extract the separated light in wavelength or wave number is complicated and requires skill and effort. On the other hand, it has also been proposed to use a microcomputer and a pulse motor to generate a pulse signal representing a predetermined function by software, and to rotate the spectroscopic element via a speed reducer. However, in this method, since the reducer is composed of gears, backlash etc. cannot be avoided, and there are problems with the linearity of the reducer and the cost.

Problems to be Solved by the Invention Accordingly, the purpose of the present invention is to eliminate the drawbacks of the prior art described above, and to make it easy to manufacture different types of signers and cams, and to reduce the load, as well as to make the adjustment simple, and moreover, It is an object of the present invention to provide a driving device for a spectroscopic element that allows the driving angle of the spectroscopic element to be controlled without problems in terms of IJ proximity and cost.

The structure of the invention, that is, the present invention transmits the driving force of Tanabata to a spectroscopic element such as a diffraction grating according to a predetermined function via a speed reducer, and calculates the wavelength +J.
In a drive device for a spectroscopic element that rotates near or wavenumber linearly, the speed reducer contacts a drive member having minute file-like unevenness formed on its outer peripheral surface, and is slightly deformed and driven by contacting with the file-like minute unevenness. A driving device t for a spectroscopic element, comprising a driven member having a soft outer surface that does not slip during force transmission, and in which the spectroscopic element is rotationally driven via the driven member.
-It is a characteristic.

In a preferred embodiment of the invention, the driving member comprises a pulley and the driven member comprises a fan-shaped plate.

Furthermore, when it is desired to increase the reduction ratio, the driven member made of a cylinder, a disk, or a portion thereof can be multi-staged to perform multi-stage reduction.

Further, in a preferred embodiment of the present invention, the motor comprises a pulse motor, a signal representing a predetermined function is output from the microcombiner and inputted to the pulse motor by software, and the spectroscopic element is connected to the driven member. rotated as a unit.

EXAMPLES Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

In the drawings, l is a motor, and when controlled by a computer as described later, it is a Nockles motor. The rotation of the motor 1 is transmitted to a spectroscopic element, for example, a diffraction grating 3, via a speed reducer 2, and the rotation angle of the diffraction grating 3 is driven and controlled according to a predetermined function in accordance with a wavelength or wave number IJ.

In a preferred embodiment of the invention, the speed reducer 2 is a motor l
It consists of a pulley 4 which is attached to the rotating shaft of the motor and functions as a driving member, and a fan-shaped plate 5 which is driven by this pulley and functions as a driven member. Outer surface 4' of pulley 4
On the other hand, the outer circumferential surface 5' of the fan-shaped plate 5, which contacts the outer circumferential surface 4' of the pulley 4, is soft and slightly deformed in contact with the above-mentioned file-shaped minute unevenness. It is made of material such as plastic. Therefore, when the pulley 4 is rotated while the two are in contact with each other, the file-like minute irregularities on the outer circumferential surface 4' are slightly deformed through a rotation mechanism formed by forming a crimp groove that engages with the outer circumferential surface 5' of the fan-shaped plate 5. The rotational driving force is transmitted from the pulley 4 to the fan-shaped plate 5 without causing any slippage between the two.

Here, since the transmission of the rotational driving force in the reduction gear of the present invention is performed via the rotation mechanism formed by the crimp groove as described above, backlash etc. do not occur, which is a problem with conventional gear reduction gears. This problem is completely resolved, and as a result, as will be described later, it becomes possible to control the drive of the rotation angle by software using a microconbeater without any problems. Also, since the fan-shaped plate 5 is made of plastic,
It is advantageous because the load is light.

Since the fan-shaped plate 5 forms part of a disk, if its radius is R and the radius of the pulley 40 is r, then the rotation speed of the fan-shaped plate 5 is the value obtained by decelerating the rotation speed of the motor 1 by the ratio r/H. becomes.

Even if the reduction gear 2 configured in this manner is used and a sine bar or cam is coupled to the fan-shaped plate 5 to rotate the diffraction grating, the advantages corresponding to the above-mentioned improvement of the reduction gear can be obtained, but the sine bar or cam still has the drawbacks mentioned above. In a preferred embodiment of the invention, the diffraction grating 3 is arranged on a fan-shaped plate 5 as shown in the figure.
It is fixed integrally to the center of the body via a support shaft, its angle is controlled by a microcomputer, and it is rotated according to a predetermined function. That is, an i4 pulse signal representing a predetermined function according to the wavelength or wave number linearity is generated from the microcomputer 6 based on the software that gives the instruction, and this signal is applied to the pulse motor l. The main smoke 1 rotates at a speed corresponding to the number of pulses of the input signal, and the rotation is immediately transmitted to the diffraction grating 3 via the one-stage reducer 2, and the diffraction grating 3 rotates at a speed corresponding to the number of pulses of the input signal. It is driven while the rotation angle is controlled. Therefore, in this embodiment, the diffraction grating 3 is directly rotationally driven only through the speed reducer 2 of the rotation mechanism by forming the crimp groove with improved linearity, and is sequentially extracted linearly in wavelength or wave number from the output slit of the spectrometer.

Effects of the Invention As described above, according to the present invention, the reduction gear is configured by a driving member and a driven member that transmit driving force through a rotation mechanism formed by crimp grooves, so that linearity can be maintained without causing any crashes or the like. In addition to being able to obtain an excellent speed reducer with a light load, this improved speed reducer allows spectroscopic elements such as diffraction gratings to be operated under microcomputer control without causing problems in linearity or cost, and is also easy to manufacture and adjust. This has the advantage that it is extremely easy to do so.

[Brief explanation of the drawing]

The drawing is a schematic perspective view showing a preferred embodiment of the spectroscopic element driving device according to the present invention. 1... Motor, double speed reducer, 3... Diffraction grating, 4...
...Pulley, 4'...Outer peripheral surface of pulley, 5...
- Fan-shaped plate, 5'...outer peripheral surface of fan-shaped plate, 6... microcomputer.

Claims (4)

[Claims] (1) In a spectroscopic element drive device that transmits the driving force of a motor to a spectroscopic element such as a diffraction grating via a reducer and drives the spectroscopic element to rotate linearly in wavelength or wave number, etc., the reducer has minute irregularities on the outer peripheral surface. a driven member having an outer circumferential surface made of a material that is slightly deformed in contact with the minute irregularities and does not slip when a driving force is transmitted, and the spectroscopic element is rotationally driven via the driven member. A driving device for a spectroscopic element, characterized in that: (2) The driving device according to claim (1), wherein the driving member is a pulley, and the driven member is a cylinder, a disk, or a part thereof. (3) The motor consists of a pulse motor, and a signal with pulse intervals etc. changed according to a predetermined function is output from the microcomputer and input to the pulse motor, and the spectroscopic element is rotated integrally with the driven member. The driving device according to claim (2), characterized in that: (4) The driving device according to claim (1), wherein the driving member is a pulley, and the driven member, which is a cylinder, a disk, or a part thereof, has multiple stages and performs multi-stage deceleration.