Image detection device, pulsed illumination device, and pulsed illumination method

Abstract

The invention relates to an image detection device, a pulse lighting device and a pulse lighting method. The image detection device is provided with: a liquid resonant lens system (3) in which the focal position changes periodically; an image detection unit (4) that detects an image of the object by means of the lens system (3); a pulsed illumination unit (5) for pulsed illumination of the objectin synchronization with the focal position; and an illumination control unit (62) that controls the pulsed illumination unit (5). The pulsed illumination unit (5) comprises: a main illumination unit (51); and an auxiliary lighting unit (52) that performs pulse lighting on the object by the main lighting unit (51) and compensates for the illuminance of the object by the auxiliary lighting unit (52)in a state where the illuminance of the object generated by the main lighting unit (51) is equal to or less than a predetermined threshold value.

Description

technical field [0001] The invention relates to an image detection device, a pulse lighting device, and a pulse lighting method. Background technique [0002] As a variable focal length lens, a liquid resonance type lens system is being developed. An image detection device that combines a pulsed illumination device with this lens system and detects an image focused on an arbitrary position of a subject is being developed (document 1: refer to Japanese Patent Application Laid-Open No. 2018-189702). [0003] In a liquid resonance type lens system, a standing wave is generated in the internal liquid by a periodic driving signal, and the focal point position of the lens is periodically changed. [0004] In the image detection device, by synchronizing pulsed illumination with a predetermined phase angle of a drive signal that drives the lens system, it is possible to detect an image on an imaging plane at a focal position corresponding to the phase angle. By setting phase angle...

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Problems solved by technology

[0009] Furthermore, it is difficult for the circuit to synchronize the pulse illumination with a short time width at high speed, so the increase in the amount of light due to the addition of light-emitting elements cannot be expected, and it is required to use a high-speed focal length such as a liquid resonance type lens system. Image detection device with variable lens and improvement of insufficient light quantity in the pulsed illumination

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