Tamron 90mm f/2.8 1:1 Macro and 135mm f/3.5 1:1 Macro Patents Found

• 8 months ago

Patents for a Tamron 90mm f/2.8 1:1 Macro and 135mm f/3.5 1:1 Macro were found by asobinet. They are translated and reproduced below:

overview

• [Publication number] P2023134075
• [Release date] 2023-09-27
• [Name of the invention] Optical system and imaging device
• [Application date] 2022-03-14
• [Applicant]
  
  [Identification number] 000133227
  
  [Name] Tamron Co., Ltd.
• An object of the present invention is to provide an optical system and an imaging device that are small and lightweight and capable of realizing rapid autofocus.
• BACKGROUND ART
  
  Conventionally, imaging devices using various solid-state imaging devices, such as video cameras, digital still cameras, single-lens reflex cameras, and mirrorless single-lens cameras, have been widespread. As these imaging devices become more sophisticated and smaller, their imaging lenses (optical systems) are also required to have even higher performance and become smaller, and macro lenses are no exception. A macro lens generally refers to an imaging lens with a maximum imaging magnification of 0.5x to 1x. Macro lenses are particularly required to suppress aberration fluctuations during focusing, such as fluctuations in spherical aberration and field curvature, to achieve high optical performance over the entire focusing range.
• [0004]
  
  Patent Document 1 adopts a positive, negative, positive, negative, and positive refractive power arrangement in order from the object side, and focuses by moving a second lens group and a fourth lens group having negative refractive power in the optical axis direction. An optical system has been proposed that does this. In this optical system, the negative refractive power of the second lens group is too strong, and it is necessary to provide a positive refractive power in the fifth lens group, which is the final lens group, in order to correct lateral chromatic aberration. Therefore, it has been difficult to reduce the diameter of the entire optical system, and it has been difficult to reduce the size and weight of the optical system.
• [0006]
  
  Accordingly, an object of the present invention is to provide an optical system and an imaging device that are small and lightweight and capable of realizing rapid autofocus.

Example 1 (- The following are macro values)

• Focal length: 92.7000-41.3760
• F value: 2.9100-5.8200
• Half angle of view: 12.6205-9.0852
• Image height: 21.6330
• Total length: 125.0000
• Back focus: 55.4000-38.5640
• Shooting magnification: 1.0

Example 2

• Focal length: 87.7998-38.9769
• F value: 2.9100-5.8200
• Half angle of view: 13.7621-8.2081
• Image height: 21.63330
• Total length: 145.2807
• Back focus: 22.8285
• Shooting magnification: 1.0

Example 3

• Focal length: 135.8005-47.1851
• F value: 3.5181-7.0000
• Half angle of view: 8.6054-5.6374
• Image height: 21.63330
• Total length: 124.0000
• Back focus: 62.0716-43.4115
• Shooting magnification: 1.0

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