Anti-myopia apparatus for reading and writing

Anti-myopia apparatus for reading and writing

CN
  • CN 100,477,975 C
  • Filed: 12/31/2005
  • Issued: 04/15/2009
  • Est. Priority Date: 12/31/2005
  • Status: Active Grant
First Claim
Patent Images

1. , a kind of anti-myopia apparatus for reading and writing, comprise support (1), a plane mirror (4), secondary plane mirror (11), it is characterized in that eyesight (7) is provided with one or a pair of lens or battery of lens (8), a plane mirror (4) directly reflects field-of-view objects light, total optical path length S=S1+S2+S3, S is more than or equal to 300mm, less than 5000mm, S1 is that a plane mirror is to being looked the thing optical path length, S2 is a plane mirror (4) to the optical path length of secondary plane mirror (11), and S3 is lens or the battery of lens optical path length to secondary plane mirror (11).

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×