# US 10,502,626 B2 · Fourier transform type spectrophotometer to control a speed of a moving mirror

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- Number: US 10,502,626 B2
- Document ID: US10502626B2
- Status: Granted
- Kind: B2
- Application number: 15/558,165
- Filed: 2015-03-13
- Published: 2018-03-15
- Granted: 2019-12-10
- Earliest claimed: 2015-03-13
- Assignees: Shimadzu Corporation
- Applicants: Shimadzu Corporation
- Inventors: Tadafumi Kamikake
- Web page: https://patentgrep.com/patent/US10502626B2

## CPC

- G01J 3/4535: {Devices with moving mirror (G01J3/4532 takes precedence)}
- G01J 3/0202: {Mechanical elements; Supports for optical elements}
- G01J 3/027: {Control of working procedures of a spectrometer; Failure detection; Bandwidth calculation}
- G01J 3/0275: {making use of sensor-related data, e.g. for identification of sensor parts or optical elements}
- G01J 3/0289: {Field-of-view determination; Aiming or pointing of a spectrometer; Adjusting alignment; Encoding angular position; Size of measurement area; Position tracking}
- G01J 3/06: Scanning arrangements {arrangements for order-selection}
- G01N 21/27: using photo-electric detection (G01N21/31 takes precedence){; circuits for computing concentration (logarithmic circuits G06G7/24; photometric circuits in general G01J)}
- G01J 2003/064: {Use of other elements for scan, e.g. mirror, fixed grating}
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A Fourier transform type spectrophotometer capable of stably controlling a speed of a moving mirror comprises a movable unit to which a moving mirror is fixed, outside-force-applying means configured to apply external force larger than movement resistance of the movable unit to the movable unit, a driving source configured to apply positive or negative driving force along the moving direction of the movable unit to the movable unit, a speed measurement unit configured to measure the speed of the movable unit, and a driving force control unit configured to control the driving force of the driving source so that the movable unit is moved in a predetermined manner based on the speed, wherein a rate of fluctuation of the driving force is suppressed by operating in a state in which the driving force of the driving source is high due to the external force to thereby stabilize the control.

## Claims

### Claim 1

A Fourier transform type spectrophotometer comprising:
a linear guide along which a moving mirror is movable;
a movable unit to which the moving mirror is fixed, the movable unit being movable on the linear guide;
an elastic member configured to always apply external force to the movable unit in a direction along the linear guide, wherein the external force is larger than movement resistance on the linear guide of the movable unit;
a driving source configured to apply positive or negative driving force along a moving direction of the movable unit to the movable unit; and
a controller configured to measure a moving speed of the movable unit and control the driving force of the driving source so that the movable unit is moved in a predetermined manner based on the moving speed.

### Claim 2 (depends on 1)

The Fourier transform type spectrophotometer as recited in claim 1,
wherein the elastic member is rubber.

### Claim 3 (depends on 1)

The Fourier transform type spectrophotometer as recited in claim 1, wherein the driving source is a voice coil motor or a hydraulic device.

### Claim 4 (depends on 1)

The Fourier transform type spectrophotometer as recited in claim 1, wherein the external force is larger than twice the movement resistance of the movable unit.

### Claim 5 (depends on 1)

The Fourier transform type spectrophotometer as recited in claim 1, wherein the elastic member is a spring.

### Claim 6

A Fourier transform type spectrophotometer, comprising:
a linear guide along which a moving mirror is movable;
a movable unit to which the moving mirror is fixed, the movable unit being movable on the linear guide;
an inclination providing structure having a first part and a second part spaced part from the first part in a horizontal direction, the first part having a vertical height higher than a vertical height of the second part, wherein the inclination providing structure is configured to incline the linear guide such that component force of gravity of the movable unit in a direction along the linear guide is greater than movement resistance on the linear guide of the movable unit;
a driving source configured to apply positive or negative driving force along a moving direction of the movable unit on the linear guide to the movable unit; and
a controller configured to measure a moving speed of the movable unit and control the driving force of the driving source so that the movable unit is moved on the linear guide in a predetermined manner based on the moving speed.

### Claim 7 (depends on 6)

The Fourier transform type spectrophotometer as recited in claim 6, wherein the driving source is a voice coil motor or a hydraulic device.