To provide an imaging optical system which images an observation image by performing switching among a plurality of observation modes, such as the plurality of observation wavelengths with different use wavelength band areas, within one optical system, and whose entire size is reduced.
The imaging optical system for imaging an observation object has an incident-face switching optical member 1 configured such that at least two light-transmitting incident faces 11a1 and 11a2 provided in a direction intersecting each other are provided, each incident face can intersect the incident optical axis O of the imaging optical system and can be turned around each of shaft members A1 and A2 perpendicular to the incident optical axis O, and the incident faces intersecting the incident optical axis O are switched by turning around the corresponding shaft members A1 and A2 perpendicular to the incident optical axis O. The incident faces 11a1 and 11a2 are different from each other in transmission wavelength characteristics. The incident faces 11a1 and 11a2 have brightness diaphragms S1 and S2 having different diameters.
| JPS5896521 | 【考案の名称】一眼レフレツクスカメラの絞り駆動装置 |
| JPH0727826 | [Name of device] Stepping motor |
| JP3327090 | [Title of Invention] Dimming element |
SUGA TAKESHI
AKIYAMA DAISUKE
Masayuki Fujinaka