摘要:
A zoom lens (101) includes a focus unit (102), a zoom unit (103), an aperture stop (104), and an imaging unit (LR) having a splitting element (105). The splitting element (105) includes an incident surface (LDa), a half mirror surface (S) for splitting a light beam into reflected light and transmitted light, a splitting exit surface (LDc) for emitting the reflected light, and an exit surface (LDb) for emitting the transmitted light. The incident and exit surfaces (LDa) and (LDb) are perpendicular to an optical axis of the zoom lens (101). The ratio of the distance from the aperture stop (104) to the exit surface (LDb) and the equivalent air length from the aperture stop (104) to an image plane (IP) of the zoom lens (101) and the ratio of the effective diameters of the exit surface (LDb) and the splitting exit surface (LDc) are set properly.
摘要:
Procédé et dispositif pour la mesure de la défocalisation affectant un instrument optique (1). Des moyens de détection (5), disposés par rapport à l'optique de l'instrument à un niveau où convergent les rayons lumineux provenant d'un objet source situé à l'infini, déterminent les positions où sont reçus les rayons lumineux qui traversent cette optique. Des moyens de séparation (4) permettent de diviser en au moins deux sous-faisceaux les rayons optiques reçus. Des moyens de traitement de données (6) permettent d'effectuer une corrélation entre deux images d'une même zone de l'objet source qui sont simultanément obtenues par l'intermédiaire des moyens de détection (5), un calcul du décalage existant entre ces deux images et un calcul d'évaluation de la défocalisation à partir de la valeur calculée de décalage entre images.
摘要:
An incident light beam from a recording medium (1) is split into substantially parallel light beams by two parallel plates (18, 19), and the split light beams radiate the detection regions of a detector. The two parallel plates (18, 19) are arranged in different directions to define the same angle with the optical axis of the light beam. When the light beam incident on the detecting regions (20A ∼ 20I) is electrically processed, at least a focal point of the light beam focused on the recording medium (1) is controlled. Two birefringent members (28, 29) can be used in place of the two parallel plates. In this case, the optic axes of the respective birefringent members (28, 29) are inclined in different directions to define the same angle with the optical axis of the light beam.
摘要:
An incident light beam from a recording medium (1) is split into substantially parallel light beams by two parallel plates (18, 19), and the split light beams radiate the detection regions of a detector. The two parallel plates (18, 19) are arranged in different directions to define the same angle with the optical axis of the light beam. When the light beam incident on the detecting regions (20A ∼ 20I) is electrically processed, at least a focal point of the light beam focused on the recording medium (1) is controlled. Two birefringent members (28, 29) can be used in place of the two parallel plates. In this case, the optic axes of the respective birefringent members (28, 29) are inclined in different directions to define the same angle with the optical axis of the light beam.
摘要:
A focus detector which comprises as follows: means (1 to 4) for irradiating a focused light beam to a surface (5) to be examined; an optical element (7) located in a vicinity of a focus point of a detection light beam formed by the irradiation light beam reflected by or passed through the surface and refocused; said optical element splitting a portion of the detection light beam only when the irradiation light beam is not in an in-focus state on the surface; and means (10) for receiving the light beam split by said optical element so as to detect a focus error signal.
摘要:
The disclosure relates to a viewing optic. In one embodiment, the disclosure relates to a viewing optic with at least one turret (8905) and a turret tracking system and an active display for generating an image