Abstract:
The present invention relates to an optical probe (1) suitable for miniature applications. An example application is a fibre-based confocal miniaturized microscope. The optical probe comprises a coil-based actuation system (9, 10) comprising drive coils (9) capable of displacing the distal end (3) of an optical guide (2) housed (4) by the optical probe. The probe makes use of a feedback loop which alternate between driving the displacement of the optical guide by driving a current through the drive coils and switching off the current through the drive coils, and while the drive current being switched off, measure the speed of the distal end of the optical guide. The measured speed is compared to the set -point speed, and if a difference is detected, the drive current is adjusted to eliminate, or at least bring down, this difference.
Abstract:
An optical disc drive apparatus (1) comprises: rotating means (4) for rotating an optical disc (2); a sledge (10) radially displaceable with respect to an apparatus frame (3); a platform (20) radially displaceable with respect to said sledge (10); an optical system (30) for scanning a disc, the optical system (30) defining an optical path (80) which is substantially fixed with respect to the sledge (10) and comprising an optical element (34) which is fixed with respect to the platform (20); an optical detector (35) fixed to said sledge (10); vibration detection means for detecting vibrations caused by the rotating disc; said vibration detection means comprising radial displacement detection means for detecting a radial displacement of said platform (20) with respect to said sledge (10).
Abstract:
The present invention relates to a method of limiting a power supply current in a system comprising a power supply (10), a motor (12) operating at different speeds, a driver (14) for driving the motor and a controller (16) for controlling the driver, the method comprising the steps of: specifying a first value that is related to a maximum power supply current (I PSmax ); determining a second value that is related to an electromagnetic force- dependent voltage (V EMF ) of the motor; determining a desired third value (C des ) that is related to a desired motor current (I Mdes ); determining a first boundary value (a) and a second boundary value (b) for the third value, taking into account the first value and the second value; comparing the boundary values (a) and (b) to the third value (C des ); and setting the third value in dependence on the result of the comparing step
Abstract translation:本发明涉及一种限制系统中的电源电流的方法,包括电源(10),以不同速度工作的电动机(12),用于驱动电动机的驱动器(14)和用于 控制驱动器,该方法包括以下步骤:指定与最大电源电流(I SUB PSmax)相关的第一值; 确定与电动机的电磁力相关电压(V EMF SUB)相关的第二值; 确定与期望的电动机电流相关的期望的第三值(C> des< / SUB); 考虑到第一值和第二值,确定第三值的第一边界值(a)和第二边界值(b); 将边界值(a)和(b)比较为第三值(C> des SUB>); 并且根据比较步骤的结果来设置第三值
Abstract:
This invention relates to an optical probe (200) and an optical imaging system, including an optical guide (201) having a proximal end and a distal end, an actuation means having driving coils (204) and a magnet, with of which being attached to the optical guide. By supplying a driving current through the driving coils a magnetic flux is generated which interacts with the magnet forming a driving force acting at on the optical guide causing a displacement of the distal end of the optical guide. A position measuring including a position measuring coil (205) is used for monitoring the position of the optical guide, where the internal arrangement of the position measuring coil and the driving coils is such that said displacement of the distal end of the optical guide causes a change in the internal arrangement. A power supply supplies an additional high frequency alternating current (AC) through the driving coils which causes an induced voltage in the position measuring coil and thus generates a magnetic coupling between the position measuring coil and the driving coils. A position measuring means measures the displacement of the distal end of the optical guide by means of measuring the induced voltage resulting in when the internal arrangement changes. This induced voltage change being indicative for the position of the distal end.
Abstract:
The present invention relates to a method of recovering energy from the turntable motor (12) in an optical disc drive comprising a power supply and a circuitry (10) that is capable of selectively feeding a current from the power supply into the motor in a first state and from the motor into the power supply in a second state, the method comprising the steps of: decelerating the motor, during decelerating the motor, repeatedly calculating a ratio between a duration of the first state and a duration of the second state in dependence on an angular velocity of the motor, such that a current integrated over the whole decelerating process is fed from the motor into the power supply, and after calculating the ratio, selecting the duration of the first state and the duration of the second state in accordance with the calculated ratio. The present invention further relates to an optical device.
Abstract:
The present invention relates to a method of recovering energy from the turntable motor (12) in an optical disc drive comprising a power supply and a circuitry (10) that is capable of selectively feeding a current from the power supply into the motor in a first state and from the motor into the power supply in a second state, the method comprising the steps of: decelerating the motor, during decelerating the motor, repeatedly calculating a ratio between a duration of the first state and a duration of the second state in dependence on an angular velocity of the motor, such that a current integrated over the whole decelerating process is fed from the motor into the power supply, and after calculating the ratio, selecting the duration of the first state and the duration of the second state in accordance with the calculated ratio. The present invention further relates to an optical device.
Abstract:
A disc drive apparatus (1) comprises a sledge (10) radially displaceable with respect to an apparatus frame (3); a platform (20) radially displaceable with respect to said sledge (10); a controllable sledge actuator (11) for moving the sledge (10) radially with respect to said apparatus frame (3); a control unit (90) for controlling said sledge actuator (11); a sledge stop detection means capable of detecting that the moving sledge (10) comes to a standstill. Said sledge stop detection means comprises radial displacement detection means for detecting a radial displacement of said platform (20) with respect to said sledge (10). Said control unit (90) receives an input signal (SXD) from said sledge stop detection means and is responsive to said input signal to switch off said sledge actuator (11) when said input signal (SXD) indicates that said moving sledge (10) has come to a standstill.
Abstract:
The present invention relates to an optical scanning probe assembly for microscopic guide optic scanning and inspection of tissues suitable for application in, e.g. in vivo medical inspection and biopsy. The assembly comprises an outer housing (3) comprising: i) a spring element for a scanning motor, the spring element formed as a hollow tube (5) adapted to receive an optical guide, the hollow tube having mechanical stiffness larger than the optical guide to be received, ii) a lens system (7) and iii) means for deflecting (6) the distal end of the hollow tube in directions transverse to the longitudinal extension of the hollow tube, so as to form an optical scan pattern. The optical assembly is particularly advantageous as it increases the freedom to optimize the optical and mechanical performance of the system which is defined respectively by the optical guide and by the hollow tube. The probe can be used in resonant and non-resonant scanning modes.
Abstract:
An optical system for detecting light from a 2D area of a sample (36) comprises a collection lens (34) for collecting light from a collection region of the sample. A light detector (44) is positionally fixed with respect to the sample, and a reflector arrangement (61) directs collected light to the detector. The reflector arrangement comprises movable components and the collection lens (34) is movable relative to the sample. The collection lens and the movable components are configurable to define different collection regions, and the movement of the components effects a direction of the light from the collection region to a substantially unchanged area of the light detector (44). This arrangement avoids the need for a bulky detector in order to detect signals from a 2D sample area formed by scanning across the sample.