Window screen with blind function

A window screen with a blind function comprising:

• a screen unit, the screen unit including:
• a translucent first screen configured to be wound upward by a winding shaft;
• a translucent second screen configured to be wound by the winding shaft together with the first screen in an overlapped manner;
• and
• a number of slats for dimming or light-shielding having a constant width and coupled between the first screen and the second screen, the slats being coupled at first and second ends thereof to both the first and second screens at regular intervals so as to be freely tiltable, and having flexibility so as to be capable of being wound by the winding shaft together with the first and second screens, wherein
• in the screen unit, one end of each of the first and second screens is attached to a peripheral surface of the winding shaft so as to allow the first and second screens to be wound in an overlapped manner,
• the first screen includes a number of engaging strips attached thereto along left and right side end portions, the engaging strips being engaged in slits of a guide rail on each of two side frames of a screen frame so as to be freely slidable,
• the first and second screens are provided with first and second bottom bars attached individually to lower ends thereof, at least the first bottom bar attached to the lower end of the first screen is disposed in first guide grooves of the side frames to guide a vertical movement of both ends thereof, and
• the first and second screens have length set so that either one of the bottom bars at the lower ends thereof comes into contact with a lower frame of the screen frame in an arbitrary inclined orientation that the slats can have in a state in which both the first and second screens are extended in the screen frame in a tensed manner.